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 b = 3 and x = -1, what is the value of 3b(b - x)?
| 36 | |
| 81 | |
| 728 | |
| 90 |