Question

solve the quadratic inequality. write the solution set in interval notation.
x^2- 9x+ 18> 0

Answer 1

i got \[-1\pm 9\sqrt{1}\] is that correct

Answer 2

can someone please help me

Answer 3

You need to use the Quadratic formula which is, http://math.about.com/od/Equations/ss/Quadratic-Function-6_2.htm

Answer 4

i know that but im not sure if i did it correct

Answer 5

show me what you got

Answer 6

\[−1±9\sqrt{1}\]

Answer 7

I got 9 and 6
\[-(-9)\pm \sqrt{(-9)^2-4(1)(18)} all \over (2)(1) \]

Answer 8

how did you get 9 and 6?

Answer 9

i got 6 and 3

Answer 10

why is the 3 -

Answer 11

because i used subtraction. the (-) just to show me which sign i have used.

Answer 12

Btw the answer is (+)

Answer 13

oh okay thank you sooo much

Answer 14

no Problem and good luck