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Wilma and Greg were trying to solve the quadratic equation x^2 + bx + c = 0.Wilma wrote down the wrong value of b (but her value of c was correct), and found the roots to be 1 and 8. Greg wrote down the wrong value of c (but his value of b was correct), and found the roots to be 1 and -4. What are the actual roots of x^2 + bx + c = 0?

 Jan 27, 2022
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Wilma    (x-1)(x-8) = x^2 - 9x + 8       and  8 is correct

Greg      (x-1)(x+4) = x^2 + 3x -4       and  3 is correct

 

 then the correct   =   x^2 + 3x + 8          use quadratic formula    x = -3/2  +- sqrt (23)i / 2

 Jan 27, 2022

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