Given that a+b+c

Question

Given that a+b+c =-6 ans z+y+z=3, find the value of 5z+5y-7b+5x-7a-7c

Answer 1

Looks scary but it's really not. The expression on the right can be easily factored.

5(z + y + z) - 7(b + a + c). We are given the values of (x + y + z) and (a + b + c).

So 5(3) - 7(-6) = 15 - (-42) = 57