Factorise.
18.x2 + 4y2 + 9z2 - 4xy + 12yz - 6zx
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X2 + 4y2 + 9z2 -4xy + 12 yz -6xz
Using identity - (x+y+z)2 = x2 +y2 + z2 + 2xy + 2yz + 2xz
So,
= (-x)2 + (2y)2 + (3z)2 + 2*(-x) *(2y) + 2*(2y)*(3z) + 2*(-x) + (3z)
(-x + 2y + 3z)2
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Using identity - (x+y+z)2 = x2 +y2 + z2 + 2xy + 2yz + 2xz
So,
= (-x)2 + (2y)2 + (3z)2 + 2*(-x) *(2y) + 2*(2y)*(3z) + 2*(-x) + (3z)
(-x + 2y + 3z)2
Kindly mark as brainliest please.
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