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Given r_1 and r_2 are the roots of the quadratic equation ax^2 + bx + c...

Given r_1 and r_2 are the roots of the quadratic equation ax^2 + bx + c = 0,

express (b^2?4ac)/2a in terms of r_1 and r_2. Re-write the quadratic formula in terms of r_1 + r_2 and

and r_1 ? r_2.

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