Then substitute 1, 2, and –2 for a, b, and c, respectively, in the quadratic formula and simplify. In Example, the quadratic formula is used to solve an equation whose roots are not rational. Then substitute 1 (which is understood to be in front of the x 2), –5, and 6 for a, b, and c, respectively, in the quadratic formula and simplify.īecause the discriminant b 2 – 4 ac is positive, you get two different real roots.Įxample produces rational roots.
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