Question

Find the value of
2x square +y square +25z square +4xy-10yz-20zx
When
x=4,y=3,z=2​

Answer 1

Answer:

$4x {}^{2} + y {}^{2} + 25x ^{2} + 4xy - 10yz - 20zx$

$</p><p> </p><p>(2x) {}^{2}+y {}^{2} +(5z {}^{2} )+</p><p></p><p> 2(2x)y + 2(y)(−5z) +2(2x)(−5z)</p><p> </p><p> </p><p></p><p> </p><p> </p><p>$

$= (2x + y - 5z) {}^{2}$

$= (2 \times - 1 + 2 - 5 \times - 3) {}^{2}$

$= (- 2 + 2 + 15) {}^{2}$

$= 15 {}^{2}$

$= 225$

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