Question

What are the zeros for -x^2+11x-21

Answer 1

I believe it's the x, which would then make the answer -21 

Answer 2

X = $\frac{-11 + \sqrt{37} }{-2}$

x = $\frac{-11 - \sqrt{37} }{-2}$
at thouse two points :) 

approximately at x = 2.5 and x = 8.5