an + an = 2an; an x an = an + n
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parallel
A quadratic equation has the form: x^2 - (sum of the roots)x + product of the roots = 0 or, x^2 - (r1 + r2)x + (r1)(r2) = 0
3x squared - 12x - 24 = 0, and -b/a = sum of the roots, and c/a = product of the roots
-9
-4,3 are the roots of this equation, so for the values for which the sum of roots is 1 & product is -12