Question

if x=2,y=3,z=4 , evaluate the following expression
y square2 +z square2 - x square2

Answer 1

4x−2y−3z)2

 We know that (x+y+z)2=x2+y2+z2+2xy+2yz+2xz

Here x=4x, y=-2y and z=-3z we get

(4x−2y−3z)2=(4x)2+(−2y)2+(−3z)2+2(4x)(−2y)+2(−2y)(−3z)+2(4x)(−3z)

=16x2+4y2+9z2−16xy+12xy−24xz

Answer 2

Answer:

21

Step-by-step explanation:

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