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 = 7 and x = -9, what is the value of -9a(a - x)?
| 273 | |
| -640 | |
| -1008 | |
| -637 |