Question

Use the expression to answer the question.
7x2y - 3z
What is the value of the expression when x = 3, y = 5, and z = -4?
A. 198
B. 222
C. 303
D. 327

Answer 1

7x2y-3z
Substitute all the numbers!

So: 7x will be 7(3), 2y will be 2(5) and 3z will be 3(-4)

7(3) • 2(5)- 3(-4)
REMEMBER PEMDAS
First multiply and then subtract, this is the right order:

21•10 = 210
3(4) = 12
So: 210-12= 198