| http://www.w3.org/ns/prov#value | - sifuentesj,-4*2 = -8and -4+2 = -2 So x??-2x-8 can be factored.There are other methods such as completing the square and the quadratic formula that can be used when you can not easily factor the expression.Here is a video on completing the squarehttps://www.khanacademy.org/math/algebra/quadratics/completing_the_square/v/solving-quadratic-equations-by-completing-the-squareAnd on the quadratic formul
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