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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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