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Im stuck on factoring.....

Im stuck on factoring... I actually can't wrap my mind around it. The question is 49m^2-16

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I need to understand the steps of factoring. I've done a question already: 36x^3-12x and I had a friend walk me through it and eventually I got the answer: 12x(3x^2+1)(3x^2-1), but I am still not sure how I got there

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