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 = -9 and z = 9, what is the value of 9a(a - z)?
| -8 | |
| -15 | |
| 1458 | |
| -28 |