Question

c)If x=4, y=3, z=-2, Find the value of
x²+y²-2²
Xy+yZ-Zx​

Answer 1

Answer:

x²+y²-(2)²

=(4)²+(3)²-(2)²

=16+9-4

=25-4

=21

xy+yz-zx

=(4)(3)+(3)(-2)-(-2)(4)

=12-6+8

=6+8

=14