c ) \(4x^2-12x-160\)
\(=4x^2-32x+20x-160\)
\(=4x\left(x-8\right)+20\left(x-8\right)\)
\(=4.x\left(x-8\right)+4.5\left(x-8\right)\)
\(=4\left(x+5\right)\left(x-8\right)\)
d ) \(5x^2y-10xy-15y\)
\(=y\left(5x^2-10x-15\right)\)
\(=y\left(5x^2-15x+5x-15\right)\)
\(=y\left[5x\left(x-3\right)+5\left(x-3\right)\right]\)
\(=y\left[5.x\left(x-3\right)+5\left(x-3\right)\right]\)
\(=y.\left[5.\left(x+1\right)\left(x-3\right)\right]\)
\(=5y.\left(x+1\right)\left(x-3\right)\)
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