Question

Suppose a-b=0 which one of these expressions equals ab

A) 2a
B)2b
C)a/b
D)0
E) b^2

Answer 1

E) b^2

Explanation:

Solving the first equation for a, we get ...

a - b = 0

a = b . . . . . . add b to both sides

Now, the expression ab can be rewritten as

ab = bb = b^2 . . . . . . substitute b for a