#### Answer

$y=3x^2-3$

#### Work Step by Step

To vertically stretch the graph of $y=x^2-1$ by a factor of 3, we multiply the right hand side by 3. Hence, the desired equation is $y=3(x^2-1)=3x^2-3$.

Published by
Pearson

ISBN 10:
0-32187-896-5

ISBN 13:
978-0-32187-896-0

$y=3x^2-3$

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