Factorise x2 – 16 please help
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There are two ways to factorize x2−16 - one using identity a2−b2=(a+b)(a−b) . Other method is by splitting the middle term, which is 0 here and as product of coefficient of x2 and constant term is −16 . we need to do is to split middle term in 4 and −4 (as their sum is zero and product is −16 )
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x²-16
=x²=16
x=√16
x=4.
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