Math Multiple Choice
If y = (x + 3)2, then (-2x - 6)2 must equal which of the following?
- (A) -4y2
- (B) -2y2
- (C) -4y
- (D) 2y
- (E) 4y CORRECT ANSWER
Explanation:
The expression (-2x - 6)2 can be rewritten as [-2(x + 3)]2, which equals 4(x + 3]2.
Since y = (x + 3)2, it follows that (-2x - 6)2 = 4(x + 3)2 = 4y. The correct answer is choice (E).