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x^2 +x - 2 = 0....

`x^2 +x - 2 = 0.`

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Here, a = 1, b = 1, c = -2
`:. X = (-b+-sqrt(b^2 - 4ac))/(2a) = (-1+-sqrt(1)^(2)-4xx1xx(-2))/(2xx1) = (-1+- 3)/(2) = 1 or -2 :. X =1or -2`
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