solve the quadratic equation x^2+8x-20=0by factorization method
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x² + 8x - 20
= = > x² + 10x - 2x - 20
= = > x ( x + 10 ) - 2 ( x + 10 )
= = > ( x - 2 ) ( x + 10 )
= = > x = 2 , -10
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