Question

(X^2 -z) (2z+5) X=5 y=-3 z=7

Answer 1

The original formula is

`(X^2-Z)(2Z+5)`

and we are asked to replace X by 5, Y by -3 and Z by 7:

-let's replace first X for 5 in the original formula:

`(5^2-Z)(2Z+5)=(25-Z)(2Z+5)`

Now we are going to replace Z by 7 in the last formula:

`(25-7)(2(7)+5)=(18)(14+5)=(18)(19)=342`

so the final result is 342