Question

Find the zeros of the function.

f(x) = 9x^2 - 27x + 20

Answer 1

do you know the quadratic equation?

Answer 2

im not really sure

Answer 3

\[\huge { -b \pm \sqrt{b^2 - 4*a*c} \over 2a}\]

Answer 4

Does that look familiar?

Answer 5

yes

Answer 6

-5/3 and -4/3 is the anserw ? right?

Answer 7

Sweet!. so the general form for a degree 2 polynomial is \[\huge ax^2+bx+c\]
Knowing that, what do you think your a, b and c are for your equation?

Answer 8

I'm not sure, i'd have to calculate it.

Answer 9

You're numbers are correct, but your signs are off. I would double check your math.

Answer 10

ohh so they are positive correct?

Answer 11

Correct.

Answer 12

thanks :D

Answer 13

Hint: The LHS can be factored. One of them is 3x-4 .

Answer 14

np