the cubic polynomial x^3 +ax^2 + bx - 8 where a and b are constants has factors x+1 and x+2. find values a and b i'm thinking you expand (x+2)(x+1) to get the quotient of x^2 + 3x + 2 but i'm not sure would be so grateful for some help thanks
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Originally Posted by gracey the cubic polynomial x^3 +ax^2 + bx - 8 where a and b are constants has factors x+1 and x+2. find values a and b i'm thinking you expand (x+2)(x+1) to get the quotient of x^2 + 3x + 2 but i'm not sure would be so grateful for some help thanks Let the third factor be (x + c). Then Match up the coefficients. -Dan
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