Question

Which is a zero of the quadratic function f(x) = 9x2 – 54x – 19?

x = 1/3
x = 3 1/3
x = 6 1/3
x = 9 1/3

Answer 1

Answer: Third Choice. x= 6 1/3

Explanation:

Given

f(x) = 9x² - 54x - 19

Completing the square

3x -19

3x 1

Substitute back to the function

f(x) = (3x-19) (3x+1)

Simplify

x= 6 1/3 or -1/3

Hope this helps!! :)

Please let me know if you have any questions