Find the value of 4 x 2 + y 2 +25 z 2 +4 xy -10 yz -20 zx when x = 4, y = 3 and z = 2.

Question

Philoid · Accepted Answer

Using the identity,

Find the value of 4x2+y2+25z2+4xy-10yz-20zx when x = 4, y = 3 and z = 2.