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WinfredVenturella465 WinfredVenturella465
  • 20-07-2015
  • Mathematics
Answered

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

A-4y2
B-2y2
C-4y
D4y

Verified Answer :

naǫ
naǫ naǫ
  • 20-07-2015

\((-2x-6)^2=(-2(x+3))^2=(-2)^2 \times (x+3)^2=4(x+3)^2 \\ \\ y=(x+3)^2 \hbox{ so } 4(x+3)^2=4y\)

The answer is D.

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