# If y= (x+3)2, then (-2x-6)2 must equal which of the following?

If $y=\left(x+3{\right)}^{2}$, then $\left(-2x-6{\right)}^{2}$ must equal which of the following?

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odgovoreh
$y={\left(x+3\right)}^{2}$
${\left(-2x-6\right)}^{2}={\left[-2\left(x+3\right)\right]}^{2}={\left(-2\right)}^{2}{\left(x+3\right)}^{2}$
=4y
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