Can this expression be factored?

4x^2+9
My homework assignment says to factor completely and this is one of the problems but I don't think this expression can be factored. Am I wrong? If so how do I factor it.

1 answer

I can not factor that

are you sure it is not

4 x^2 - 9

that would be the difference of squares which is
(2 x - 3)(2 x + 3)
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