Question

x^2+14x+7

Answer 1

Factor?

Answer 2

i have to find the x intercepts so do i factor or use the quadratic formula?

Answer 3

if you need to find x-intercepts it's x^2+14x+7=0 and you solve using the quadratic formula.

Answer 4

You can't really factor this off the top of your head, the numbers are irrational.

Answer 5

ok i did that and got -7 +/- square root of 84 and apparently that was wrong so I'm not sure what I am doing wrong

Answer 6

x-intercepts for that equation would be:
\[-7+\sqrt{42}\]
\[-7-\sqrt{42}\]

Answer 7

how did you get the 42?

Answer 8

\[\frac{ -14\pm \sqrt{168} }{ 2 }\]
\[(\sqrt{168}=2\sqrt{42})\]
\[\frac{ 2(-7\pm \sqrt{42}) }{ 2 }\]
\[-7\pm \sqrt{42}\]