Select the approximate values

Question

Select the approximate values of x that are solutions to f(x) = 0, where
f(x) = -9x2 + 6x + 5.

Answer 1

-9x²+6x+5=0

use the quadratic equation

 

[-6+√(36+180)]/-18

[-6+√216]/-18

[-6+6√6]/-18

(-1+√6)/-3

(-1+2.449489)/-3

(-1+2.449489)/-3 and (-1-2.449489)/-3

1.449489/-3=-0.48316

-3.449489/-3=1.149829

Answer 2

   -9x2 + 6x + 5 = 0

     -18 + 6x +5 = 0 

     -18+ 6x = -5

         6x = 18-5

         6x = 13

            x = 13/6

            x = 2.16