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(2x + 3y + 4z)2 = .................A) 4x2 + 9x2 + 16z2 + 12xy + 24yz + 16xz B) 2x2 + 34y2 + 4z2 + 6xy + 12yz + 8xzC) 4x2 + 9y2 + 16z2 D) 4x2 + 9y2 + 16z2 + xy + yz + zx |
Answer» Correct option is (A) \(4x^2+9y^2+16z^2+12xy+24yz+16xz\) \((2x+3y+4z)^2\) \(=(2x)^2+(3y)^2+(4z)^2+2\times2x\times3y\) \(+2\times3y\times4z+2\times2x\times4z\) \(=4x^2+9y^2+16z^2+12xy+24yz+16xz\) A) 4x2 + 9x2 + 16z2 + 12xy + 24yz + 16xz |
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