Solve (a) x^2+2x-8=0 and
(b) 3x^2 - 11x -4=0 by using the quadratic
formula.

Question

Solve (a) x^2+2x-8=0 and
(b) 3x^2 - 11x -4=0 by using the quadratic
formula.

baayen · Answer

Do you know what the quadratic formula is?

3mar · Answer

I know factorization!

baayen · Answer

Okay good, but this problem is asking you to use the quadratic formula. Does $$-b \pm \sqrt{b ^{2}-4ac}   \over  2a $$ look famillar?

3mar · Answer

Yes, then?

baayen · Answer

x^2+2x-8=0, so looking at this equation can you tell me what is a b and c? hint, standard form is ax^2+ bx+c=0

3mar · Answer

a=1
b=2
c=8

baayen · Answer

Okay good, now plug those into the formula I gave you earlier

3mar · Answer

Yes.
and simplify and get two values. is not it?

baayen · Answer

No that's correct, do you know what those two values are?

3mar · Answer

did not get them yet

baayen · Answer

Mind showing me what you got after you plugged them into the quadratic formula?

3mar · Answer

gig you get them?

baayen · Answer

Are you asking me to just give you the answers? lol

3mar · Answer

Thanks a lot. I got the answer.

baayen · Answer

Was that sarcasm? Can't tell sorry

3mar · Answer

Excuse me??