Solve (find x intercepts) using the quadratic formula

f(x)= -5x^+9x-4​ ​

-intercepts at and

Step-by-step explanation:

A quadratic in the form crosses the -axis when .

The first step is replacing with .

So: . With the information above, we can find the intercepts by setting .

Therefore .

Now we can use the quadratic formula because it is in the form .

Note the quadratic formula: .

To find the values of , and we can compare the equation to the general equation.

Therefore: , and .

Now put these values into the quadratic formula:

And simplify:

, .

, therefore

Now we can have two values for . One when we take away the discriminant () and one when we add it.

So

or

Therefore -intercepts at and

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6