Question

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

Answer 1

4x²+y²+25z²+4xy-10yz-20zx
when x=4, y=3 &z=2
so
=>4(4)²+(3)²+ 25(2)²+4(4)(3)-10(3)(2)-20(2)(4)
=>64+9+100+48-60-160
=>221-220
=>1

Answer 2

4x^2 + y^2 + 25z^2 + 4xy - 10yz -20zx
64 + 9 + 100 + 48 - 60 - 160
answer is 1