find the value of 4x^2 + y^2 + 25z^2 + 4xy - 10yz - 2xz when x = 4 , y = 3 and z = 2
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= 4(4)² + (3)² + 25(2)² + 4(4)(3) - 10(3)(2) - 2(4)(2)
= 64 + 9 + 100 + 48 - 60 - 16
= 145
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