Question

c.3xy+ 4yz + 4zx - x²-y²-z² ,if x=2,y=3 and z=(-2)
it's very important at 5.00p.m. my exam is there I am doing practise and I don't understand this sum urgent I want.​

Answer 1

Answer:

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

= 18 -24-16-4-9-4

=18-57

=(-39)

Answer 2

I hope it will help you ...