When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
If a = -2 and z = 7, what is the value of -9a(a - z)?
| -162 | |
| -168 | |
| 390 | |
| -132 |