Algebrahard · Past Paper
Factorize x^2 + 4y^2 + 9z^2 + 4xy + 12yz + 6zx.
A(x+2y+3z)^2
B(x-2y-3z)^2
C(x+y+z)^2
D(2x+3y+z)^2
✓ Correct Answer: A — (x+2y+3z)^2
This is the expansion of (a+b+c)^2 = a^2+b^2+c^2+2ab+2bc+2ca.
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