4 x^2 - 16 x - 1 = 0
x = [ 16 +/- sqrt (256 + 16) ] / 8
x = [ 16 +/ - sqrt (16*17) ] / 8
x = 2 +/ - .5 sqrt 17
by the way by inspection you can see that it is going to be very close to
4 x^2 - 16 x = 0
x(x-4) = 0
x = 4 or 0
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