how do you factor 9-x2

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It is the difference of perfect squares, so it would be (3+x)(3-x).

square of differences. remember if both numbers are perfect square just find the square roots of both of them and add the square roots together and subtract the square roots then multiply them. answer is (3+x)(3-x) because i took square roots of both numbers and got 3 and x so i add 3+x and multiply that by 3-x