Question
Simplify:$(3x + 5y + 2z)(3x - 5y + 2z)$
✓
Answer
$(3x + 5y + 2z)(3x - 5y + 2z)$
$= (3x + 2z + 5y)(3x + 2z - 5y)$
$= (3x + 2z)^2 - (5y)^2$
$= 9x^2 + 2(3)(2z) + 4z^2 - 25y^2$
$= 9x^2 - 25y^2 + 4z^2 + 12xz.$
$= (3x + 2z + 5y)(3x + 2z - 5y)$
$= (3x + 2z)^2 - (5y)^2$
$= 9x^2 + 2(3)(2z) + 4z^2 - 25y^2$
$= 9x^2 - 25y^2 + 4z^2 + 12xz.$
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