GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM

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1 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 1 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM I) THE STANDARD FORM OF A QUADRATIC FUNCTION (PARABOLA) IS = a +b +c. To graph a quadratic function in standard form ou must know where the verte is relative to the -ais. The verte ma be to the left of, on or to the right of the -ais. Recall that c indicates the location of the -intercept. We can use the signs of a and p to indicate the position of the verte relative to the -ais. Complete the investigation below to learn how to determine the position of the verte relative to the -ais of a quadratic function in standard form. II) INVESTIGATION 1: Answer the questions for each quadratic function. Answer the summar questions at the end of the investigation. 1) = State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais R. Ashb 017. Duplication b permission onl.

2 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 ) = + State the position of the verte relative to the -ais. 5) = + State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais R. Ashb 017. Duplication b permission onl.

3 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 3 7) = State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais R. Ashb 017. Duplication b permission onl.

4 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 ) = + State the position of the verte relative to the -ais ) = + State the position of the verte relative to the -ais ) = + 3 State the position of the verte relative to the -ais R. Ashb 017. Duplication b permission onl.

5 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM ) = State the position of the verte relative to the -ais ) = State the position of the verte relative to the -ais Conclusions: The verte is on the -ais when b =. The verte is on the left side of the -ais when the signs of a & b are the. The verte is on the right side of the -ais when the signs of a & b are. III) Steps to Graph Quadratic Functions in Standard Form A) USE THESE STEPS TO SOLVE OPTIMIZATION PROBLEMS 1: Use the signs of a & b to determine the position of the verte relative to the -ais and the -intercept. : Create a table of ordered pairs using values of starting at = 0 for the side of the -ais that where the verte is located until the verte is located. 3: Plot the points on a grid. Use the ais of smmetr to plots corresponding points on the other side of the parabola. R. Ashb 017. Duplication b permission onl.

6 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 B) SAMPLE PROBLEMS 1: Stud these eamples carefull. Be sure ou understand and memorize the process used to complete them. Instructions: Graph these quadratic functions. 1. = 7 1: Use the signs of a & b to determine the position of the verte relative to the -ais and the -intercept. a = & b = The verte is the -ais : Create a table of ordered pairs using values of starting at = 0 for the side of the -ais that where the verte is located until the verte is located. b =, therefore the verte is on the -ais. Use = 0, 1, & 3 to determine ordered pairs (0) 7 = 0 7 = 7 these are the coordinates of the verte 1 (1) 7 = 1 7 = 3 () 7 = 7 = 3 3 (3) 7 = 9 7 = 3: Plot the points on a grid. Use the ais of smmetr to plots corresponding points on the other side of the parabola = 1: Use the signs of a & b to determine the position of the verte relative to the -ais and the -intercept. a = & b = The verte is on the side of the -ais Continued on the net page. R. Ashb 017. Duplication b permission onl.

7 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 7 : Create a table of ordered pairs using values of starting at = 0 for the side of the -ais that where the verte is located until the verte is located. a & b have signs, therefore the verte is on the side of the - ais. Use =, etc. to determine ordered pairs. 0 0 (0) (0) = 0 0 = (1) (1) = 1 = 3 () () = = these are the coordinates of the verte 3 3 (3) (3) = 9 1 = 3 3: Plot the points on a grid. Use the ais of smmetr to plots corresponding points on the other side of the parabola = + 1: Use the signs of a & b to determine the position of the verte relative to the -ais and the -intercept. a = & b = The verte is on the side of the -ais : Create a table of ordered pairs using values of starting at = 0 for the side of the -ais that where the verte is located until the verte is located. a & b have the signs, therefore the verte is on the side of the - ais. Use =, etc. to determine ordered pairs. + 0 (0) + (0) = 0 0 = the coordinates of the verte are 1 ( 1) + ( 1) = 1 1 = between these two coordinates 0 ( ) + ( ) = = 0 3 ( 3) + ( 3) = 9 3 = Continued on the net page. R. Ashb 017. Duplication b permission onl.

8 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 In this case we must calculate the coordinates of the verte as illustrated here. Calculate the equation of the ais of smmetr: = 1 + = +1 = 1 = 0.5 Calculate the minimum: = + = ( 0.5) + ( 0.5) = =.5 State the coordinates of the verte: V ( 0.5,.5) 3: Plot the points on a grid. Use the ais of smmetr to plots corresponding points on the other side of the parabola C) REQUIRED PRACTICE 1: Complete these questions. 1) Draw the graphs for the quadratic functions in question 5 on page 370. ) Answer question 11 on page ) Draw the graph for the quadratic function in question a on page R. Ashb 017. Duplication b permission onl.

9 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM R. Ashb 017. Duplication b permission onl.

10 FOM 11 T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 ASSIGNMENT: PRINT THIS INFORMATION ON YOUR OWN GRID PAPER LAST then FIRST Name T7 GRAPHING QUADRATIC FUNCTIONS IN STANDARD FORM 1 Block: Show the process required to complete each problem to avoid receiving a zero grade. Neatness Counts!!! (Marks indicated in italicized brackets) REMEMBER TO USE GRID PAPER FOR ALL ASSIGNMENTS!!! Graph these quadratic functions. State the domain and range. REMEMBER TO INCLUDE ALL INORMATION DISCUSSED IN THE CLASS. 1) = +1 ) = + 3) f ( ) = R. Ashb 017. Duplication b permission onl.

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