Question 541032
x^3+7x^2-4x-28=0



(x^3+7x^2)+(-4x-28)=0



x^2(x+7)+(-4x-28)=0



x^2(x+7)-4(x+7)=0



(x^2-4)(x+7)=0



(x-2)(x+2)(x+7)=0



x-2=0, x+2=0, x+7=0



x=2, x=-2, x=-7



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