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

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

2020-10-21
$$\displaystyle{y}={\left({x}+{3}\right)}^{{2}}$$
$$\displaystyle{\left(-{2}{x}-{6}\right)}^{{2}}={\left[-{2}{\left({x}+{3}\right)}\right]}^{{2}}={\left(-{2}\right)}^{{2}}{\left({x}+{3}\right)}^{{2}}$$
=4y

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