0
y = -4x2 - 16x - 11
you can try to factor it or use the quadratic formula:
x = (-b + (b2-4ac)1/2)/(2a)
x = (-b - (b2-4ac)1/2)/(2a)
so...
x = (16 +/- (162- (4*-4*-11))1/2)/(2*-4)
x = (16 +/- (80)1/2)/-8
in decimals, you have:
x = (16+8.944)/-8 = -3.118
x = (16-8.944)/-8 = -0.882
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