0
X^2 + 4X -7 = 0
needs quadratic equation
-b +/- sqrt(b^2-4ac)/2a
a = 1
b = 4
c = -7
-4 +/- sqrt(4^2-4(1)(-7))/2(1)
-4 +/- sqrt(16+28)/2
-4 +/- sqrt(44)/2
-4 +/2sqrt(11)/2
exact answer, less factoring
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