Question 1010016
we write this quadratic equation as
(x-7) * (x+3) = 0
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note that x - 7 = 0, x = 7 and x + 3 = 0, x = -3
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multiply (x-7) by (x+3) and we get
x^2 -4x -21 = 0
where a = 1, b = -4 and c = -21