Factor the following polynomials

9-x^2
4x^2+81-36
4y2^+16y+16
x2^-25/x+5

4 answers

assistance needed
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hints
first one is a basic example of "difference of squares"

second does not factor

third is a perfect square, (2y+4)^2

the last one, factor the top as a difference of squares, then cancel one of those factors with the denominator.
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