Question

Determine where f(x) intersects the x-axis.

f(x)=x2−18x+80

Answer 1

f(x) intercepts the x-axis when y=0.
x² - 18x + 80 = 0
if you find the roots, you will find your answer.

Answer 2

(x+10)(x-8)?

Answer 3

Notice that -10 -8 = - 18 and that (-10)(-8) = +80.
So, the factoring would be (x-10)(x-8) = 0, what gives us x = 10 and x = 8.

Answer 4

Ahh okay my mistake, so factoring it out would be (x-10)(x-8)
was the last part of your response a question? What is the next step from here? thank you for your help

Answer 5

If x = 10 and x = 8, and you already know that you made y = 0, what are the coordinates?
First one is (10,0) and the second?
Anytime.