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Factor the polynomial $x^2-4x$ by it's greatest common factor (GCF): $x$
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$\lim_{x\to4}\left(\frac{x^2-16}{x\left(x-4\right)}\right)$
Learn how to solve limits by direct substitution problems step by step online. Find the limit (x)->(4)lim((x^2-16)/(x^2-4x)). Factor the polynomial x^2-4x by it's greatest common factor (GCF): x. Factor the difference of squares x^2-16 as the product of two conjugated binomials. Simplify the fraction . Evaluate the limit \lim_{x\to4}\left(\frac{x+4}{x}\right) by replacing all occurrences of x by 4.