SOLUTION: factor : x^2 - 121

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Question 1015820: factor : x^2 - 121
Answer by ikleyn(52803) About Me  (Show Source):
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factor : x^2 - 121
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x%5E2+-+121 = x%5E2+-+11%5E2 = (x+11)*(x-11).

Since a%5E2+-+b%5E2 = (a+b)*(a-b).