Factorise, 9x2 + 4y2 + 25z2 – 12xy - 20yz + 30xz
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Answer:
4x²+9y²+16z²+12xy-24yz-16xz
= (2x)²+(3y)²+(-4z)²+2[(2x)(3y)+(3y)(-4z)+(-4z)(2x)]
=(2x+3y-4z)²
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