12(4)3b7(4) - 4
144b + 125 - 4
144b + 121
To find the value of b that makes the expression equal to 81, we can solve the equation:
144b + 121 = 81
Subtract 121 from both sides:
144b = 81 - 121
144b = -40
Divide both sides by 144:
b = -40/144
Simplifying the fraction:
b = -5/18
Therefore, the value of b needed for the expression to have a value of 81 when a = 4 is -5/18.
In the expression below if a = 4, what value of b is needed for the expression to have a value of 81?
12a3b7(ab)-4
1 answer