Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 1 - Functions - 1.2 Representing Functions - 1.2 Exercises - Page 24: 53

Answer

Shift the parent function by $\frac{1}{2}$ unit to the left, vertically scale by a factor of 4, reflect across teh $x$-axis, shift by 13 units up

Work Step by Step

We are given the function: $h(x)=-4x^2-4x+12$ Rewrite the function by completing the square: $h(x)=-4(x^2+x)+12=-4\left(x+2\frac{1}{2}x+\dfrac{1}{4}\right)+4\left(\frac{1}{4}\right)+12=-4\left(x+\frac{1}{2}\right)^2+13$ We start graphing with the parent function $p(x)=x^2$. First shift $p(x)$ by $\frac{1}{2}$ units to the left to get the function $g(x)=\left(x+\frac{1}{2}\right)^2$. Then vertically scale $g(x)$ by a factor of 4 to get $k(x)=4\left(x+\frac{1}{2}\right)^2$. Then reflect $k(x)$ across the $x$-axis to get the function $i(x)=-4\left(x+\frac{1}{2}\right)^2$. Finally shift the function $i(x)$ by 13 units up to get the function $h(x)=-4\left(x+\frac{1}{2}\right)^2+13$. Graph all transformations:
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