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abx² = ( a+ b)² (x-1)

$a b x^{2} = (a + b)^{2} (x - 1) a b x^{2} - (a + b)^{2} x + (a + b)^{2} = 0 x = \frac{- b \pm \sqrt{b^{2} - 4 a c}}{2 a} = \frac{(a + b)^{2} \pm \sqrt{((a + b)^{2})^{2} - 4 \times a b \times (a + b)^{2}}}{2 \times a b} = \frac{(a + b)^{2} \pm \sqrt{(a + b)^{2} [(a + b)^{2} - 4 a b]}}{2 a b} = \frac{(a + b)^{2} \pm (a + b) \sqrt{a^{2} + b^{2} - 2 a b}}{2 a b} = \frac{(a + b)^{2} \pm [(a + b) (a - b)]}{2 a b} = \frac{(a + b)^{2} + [(a + b) (a - b)]}{2 a b}, \frac{(a + b)^{2} - [(a + b) (a - b)]}{2 a b} = \frac{(a + b) (a + b + a - b)}{2 a b}, \frac{(a + b) (a + b - a + b)}{2 a b} = \frac{(a + b)}{b}, \frac{(a + b)}{a}$

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