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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

Respuesta :

eunice1234

Answer: Third Choice. x= 6 1/3

Step-by-step 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!! :)

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