I believe by completing the square.
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X2 9 can be described mathematically to be a quadratic function.
x2+6x-7 = (x+7)(x-1) when factored
quadratic
no
That doesn't factor neatly. Applying the quadratic formula, we find two real solutions: (-1 plus or minus the square root of 265) divided by 12 x = 1.2732350496749756 x = -1.439901716341642