Suppose a-b=0 which one of these expressions equals ab
a) 2a
b)2b
c)a/b
d)0
e) b^2

  E)  b^2

Step-by-step 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

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