Explain why it makes sense to call the expression a2 20x 100 a perfect square O It is equivalent to the factored expression x 10 2 so therefore it is a perfect square It is equivalent to the factored expression x 5 so therefore it is a perfect square O It is equivalent to the factored expression x 5 x 5 so therefore it is a perfect square O It is equivalent to the factored expression x 10 x 10 so therefore it is a perfect square