3x^2+3x-90=0 By splitting middle term
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3x ^ 2 + 3x - 90 = 0 Rightarrow 3x^ 2 +(18-15)x-90=0 > 3x ^ 2 + 18x - 15x - 90 Rightarrow 3x(x+6)-15(x+6)=0 Rightarrow(3x-15)(x+6)=0. Rightarrow x= 15 3 pi6 x = 500
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