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Find the value of b^(2) - 4ac, if (i) ...

Find the value of `b^(2) - 4ac`, if
(i) `a= 3,b= 9 , c = 6 ` (ii) ` a= 2, b = - 8 , c = 8 `
(iii) ` a= 1, b = 1 , c = 1 `.

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