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What is the solved quadratic equation to 2x squared-11x-21 equals 0?
Wiki User
∙ 13y ago
2X^2 - 11X - 21 = 0
quadratic equation
X = -b +/- sqrt(b^2 -4ac)/2a
a = 2
b = - 11
c = - 21
X = -(-11) +/- sqrt[(-11)^2 - 4(2)(-21)]/2(2)
X = [11 +/- sqrt( 289)]/4
X = [11 +/- 17]/4
X = 7
X = - 3/2
My TI-84 graphs original equation and confirms answers
Wiki User
∙ 13y ago
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