Question

x =5 and z = 4 z2 - 2x

Answer 1

Answer:

Whenever you see a letter beside a number, just know you should multiply that number by the letter. So z = 4, then 2z = 2×4, and x = 5, then 2× 5.

so : 2×4 = 8 - 2×5

so : 8-10

so the answer would then be -2.

Answer 2

Step-by-step explanation:

I have explained in comments

hope it helps