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Question
Simplify:
(3x + 5y + 2z)(3x - 5y + 2z)
Sum
Solution
(3x + 5y + 2z)(3x - 5y + 2z)
= (3x + 2z + 5y)(3x + 2z - 5y)
= (3x + 2z)2 - (5y)2
= 9x2 + 2(3)(2z) + 4z2 - 25y2
= 9x2 - 25y2 + 4z2 + 12xz.
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