Question

b^2+16b+1=0

is the answer b=8+3root7?

Answer 1

\[\large{x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}}\]

are you sure that you applied this formula?

Answer 2

It says complete the square do i still do the quadratic formula?

Answer 3

If requests that you complete the square, you should do so. I think you have it almost whipped, check your signs.

Answer 4

ahh it should be a - 8

Answer 5

no if it says complete the square then :

\[\large{b^2+16b+1=0}\]
\[\large{b^2+16b+1+64=0+64}\]
\[\large{(b+8)^2 = 63}\]
\[\large{b = \sqrt{63} -8}\]

Answer 6

I came up with:\[-8\pm3\sqrt{7}\]

Answer 7

\[\large{b = -8 \pm \sqrt{63}}\]
\[\large{b = -8 \pm 3\sqrt{7}}\]

Answer 8

Note that \[\sqrt{63}=\sqrt{9}\sqrt{7}\]

Answer 9

got it @tvise ?

Answer 10

Yes. When i originally did it i did not isolate the variable so when i re did it i forgot to change signs

Answer 11

no problem, take care of it from now, :)

Answer 12

Good luck, and the "signs" can bite you. lol