Factorise fully x2+4xx^2+4xx2+4x and x2+9x+20x^2+9x+20x2+9x+20
Hence simplify fully x2+4xx2+9x+20\displaystyle \frac{x^2 + 4x}{x^2 + 9x + 20}x2+9x+20x2+4x
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