Question

Solve P = 4(3a – b) for a in terms of P and b. You must show all work.

Answer 1

Distribute the 4 into the brackets first and solve by moving the terms.

Answer 2

multiply out. P = 12a - 4b Now move -4b to the left hand side because you want to isolate 12a
+4b +4b So you add 4b to both sides
P+4b = 12a Divide by 12 on both sides to get a
P+4b/12 = a Reduce 4b/12 by dividing by 4
P+ b/___ = a Final answer

Answer 3

4b / 12 = 2(2b) / (2(2)(3)) = b / 3
Cancel the two 2's in the fraction