Question

Hi! Can you check my answers to this worksheet? They're the only questions I'm not positive about my answers on.

1. Compared to its parent function, describe the transformation of the following: y = -x3 + 2

A. Reflected with respect to x-axis, moved up 2.
B. Reflected with respect to y-axis, moved up 2.
C. Reflected with respect to origin, moved up 2.
D. Reflected with respect to x-axis, moved down 2.


Answer: B

2. Compared to its parent function, the transformation of the following: y = -3(x-2)^2 + 4

A. Becomes wider, moves 2 to the right and 4 up.
B. Becomes wider, moves 2 to the left and 4 up.
C. Reflected with respect to x-axis, becomes narrower, moves 2 to the right and 4 up.
D. Reflected with respect to x-axis, becomes narrower, moves 2 to the left and 4 up.

Answer: A

3. Compared to its parent function, the transformation of the following: y = -3 (square root of x minus 3) + 4

A. Reflected with respect to x-axis, stretched vertically, moved 3 to the left and 4 up.
B. Stretched horizontally, moved 3 to the right and 4 up.
C. Reflected with respect to x-axis, stretched vertically, moved 3 to the right and 4 up.
D. Stretched horizontally, moved 3 to the left and 4 down.

Answer: B

4. Compared to its parent function,the transformation of the following: y = 2|x+4| - 3

A. Becomes wider, moves 4 to the right and 3 up.
B. Becomes wider, moves 4 to the left and 3 down.
C. Becomes narrower, moves 4 to the right and 3 up.
D. Becomes narrower, moves 4 to the left and 3 down.

Answer: B

Thank you in advance :)

Answer 1

Sorry, the first question should be y = -x^3 + 2

Answer 2

1A reflection in the x-axis changes the sign of y.
parent: x^3
flip over x: -x^3
raise 2: -x^3+2

2C y becomes taller, which has the equivalent effect of making the graph look narrower.

parent: x^2
shift right (x-2)^2
flip over x: -(x-2)^2
stretch up (make narrower): 3(x-2)^2
shift up: -3(x-2)^2 + 4

3C
parent: √x
shift right: √(x-3)
flip over x: -√(x-3)
stretch up: -3√(x-3)
shift up: -3√(x-3) + 4

4D
parent: |x|
shift left: |x+4|
stretch up (make narrower): 2|x+4|
shift down: 2|x+4|-3

wolframalpha is your friend. #4 is graphed below. You can verify the others.

http://www.wolframalpha.com/input/?i=plot+y%3D|x|%2C+y%3D2|x%2B4|-3

Answer 3

Writing Parent Transformation Equations August 29, 2011
Write an Equation for a function that has a graph with the given characteristics.
1. Theshapeofy
2. Theshapeofy
3. Theshapeofy x , but shifted left 7 and up 2 units.
4. Theshapeofy
5. Theshapeofy
x3 , but reflected over the x-axis and shifted right 5 units.
1 , but shrunk vertically by a factor of 1⁄2 and shifted down 3 units.
x
x2 , but reflected over the x-axis and shifted right 8 units. x , but shifted left 6 units and down 5 units.
1. ___________________
2. ___________________
3. ___________________
4. ___________________
5. ___________________
6. ___________________
7. __________________ 8. ___________________
9. ___________________ 10. __________________
6. Theshapeofy
7. Theshapeofy
8. Theshapeofy x , but stretched vertically by a factor of 5 and shifted down 4 units.
x2 , but shifted right 6 units and up 2 units.
x2 , but reflected over the x-axis and shifted right 3 and up 4 units.
9. Theshapeofy
10. Theshapeofy
Write the equation for each function graphed.
x , but reflected across the y-axis and shifted left 2 and down 4 units. 1 , but reflected across the y-axis and shifted up 7 units.
x
11.
12. 13.
__________________________
14.
__________________________
____________________________
15. 16.
___________________________
________________________________
___________________________
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