solve the following quadratic equation by factorisation x2_ 15 x t 54 = 0958
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x2 -15+ 54=0
x2 - 9x - 6x + 54 =0
= x(x - 9) - 6(x - 9) =0
= ( x -9 ) ( x - 6) =0
= x - 9 = 0 / x - 6 =0
x = 9 / x = 6
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