Factorise x2+4y2+9z2-4xy-12yz+6zx
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Answer:
x² +4y² +9z² -4xy-12yz+6zx
= x² +(2y)² +(3z)² - 2×x×2y-2×2y×3z+2 ×3z×x
= (x - 2y +3z) ²
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