Question

Factorize: 4x2 + y2+ 25z2-10yz -20zx + 4xy and hence find its value when x=-1, y=2 and z =-3

Answer 1

Answer:

34

Step-by-step explanation:

4x²+y²+25z²-10yz-20zx+4xy=(2x+y-5x)²

lets substitute the value of x,y,and z in the equation

∴4(-1)²+(2)²+25(-3)²-10(2)(-3)-20(-3)(-1)+4(-1)(2)

∴4+4+34+60-60-8

∴8+34+60-60-8

∴8-8+60-60+34

=34

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