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The Quadratic Formula gives the value of x in equations of the form ax2 + bx + c.
In this instance a = 4, b = 11 and c = -21.
((-b +/-(sqrt(b2 - 4ac))/2a
= (-11 +/- sqrt (121 + 336))/ 8
= (-11 +/- 21.4)/8
x = 1.3 or 4.05
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