Solve x^2 + 9x = –3.
(using quadratic formula)

Question

Solve x^2 + 9x = –3.
(using quadratic formula)

comm.dan · Answer

Do you know the Quadratic Formula?

anonymous · Answer

Rearrange to get it in the form $ax^2 +bx+c=0$ (shouldn't be too hard)
and then use $$x = \frac{-b \pm\sqrt{b^2-4ac}}{2a}$$ substituting the values that you find. Hope that helps!

comm.dan · Answer

What is the a, b, and c in this equation? @Britt101

anonymous · Answer

to start of the function would be $$x^2+9x+3=0$$

anonymous · Answer

a=1 b=9 c=3

comm.dan · Answer

Good, now plug in the a, b, and c into the quadratic formula. @Britt101

comm.dan · Answer

Tell us what you get as your final answer or ask any questions if you have any, as needed. @Britt101

ryan123345 · Answer

Go Luis!

anonymous · Answer

-9+or-(squared) 69/2?

anonymous · Answer

@Comm.Dan

anonymous · Answer

Just if anyone wants to copy this code:  [x=\frac{-b \pm \sqrt{b^2-4ac}} {2a}\] 
Smash in a \ at the beginning

comm.dan · Answer

I think you might've subtracted wrong @Britt101

anonymous · Answer

no you're right but its square root

anonymous · Answer

now you have to solve for x when its + and when its -

comm.dan · Answer

@galacticwavesXX Are you trying to say that she is right?

anonymous · Answer

im saying she hasn't solved for it completely

comm.dan · Answer

Ok. Just wanting to make sure. @galacticwavesXX

anonymous · Answer

no that as far as im suppose to go. I don't have to solve for x.

anonymous · Answer

she has $$\frac{ -9\pm \sqrt{69} }{ 2 }$$

anonymous · Answer

now she has to solve for x which shouldn't be too hard

anonymous · Answer

yeah that what i chose for my answer it dose not ask to go and find x.

comm.dan · Answer

@Britt101 Just solve for both of the x's and you will find it easy after you do some practice.

anonymous · Answer

oh ok just making sure!

anonymous · Answer

thanks you guys :) I really glad ya'll both helped :) Thanks.

anonymous · Answer

you welcome anytime!

comm.dan · Answer

No problem. Do you have any more questions at this time? @Britt101

anonymous · Answer

@galacticwavesXX What are the solutions of 4x2 – 3x – 5 = 0?
is it $$\frac{3 \pm \sqrt{89}} {8} $$

anonymous · Answer

let me do it first see if you got it

anonymous · Answer

okay

anonymous · Answer

yes it is correct

anonymous · Answer

you got it!!:)

comm.dan · Answer

Nice job. Do u have any more regular or clarification questions? @Britt101

anonymous · Answer

yeah
Solve. 3x2 = 147
x=7 or
x=7 &  x=-7?
I think it's x=7&x=-7