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Question
Simplify:
(2x - 4y + 7)(2x + 4y + 7)
Solution
(2x - 4y + 7)(2x + 4y + 7)
= (2x + 7 - 4y)(2x + 7 + 4y)
= (2x + 7)2 - (4y)2
= 4x2 + 2(2x)(7) + 72 - 16y2
= 4x2 - 16y2 + 28x + 49.
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