Question

How do I solve this?
-3x2 - 4x - 4 = 0
Please help!!

Answer 1

You don't know how to solve quadratic!

Answer 2

there are 3 methods to do this
-Complete the square
-Quadratic formula
-Focatoring

Answer 3

\(\large \rm -3x^2-4x-4=0 ~~\Longrightarrow 3x^2+4x+4=0\)
after multiplying out -1
First thing you need to do is test the discriminant \(\large \rm \Delta=b^2-4ac\)
if it less than zero then this has complex solution is it positive then it has
real solution

Answer 4

I already tried to solve it using the quadratic formula >.< The answer I got was 2/3 (1-sqrtof2) But this is somehow not correct because the only answers that are possible are as follows. And I'm sure what I did wrong :c

Answer 5

*i'm not sure >.<

Answer 6

well that's because you didn't solve it the right way

Answer 7

\(\large \rm \Delta=4^2-4*4*3=16-48=-32\)
so we have complex solutions here
we need quadratic formula
\(\large \rm x=\frac{-4\pm \sqrt{-32}}{6}\)
\(\Huge \rm x=\frac{-4\pm \sqrt{(-1)*16*2}}{6}=\frac{-4\pm 4i\sqrt{2}}{6}\)
\(\Huge x=\frac{-2\pm 2i\sqrt{2}}{3}\)

Answer 8

@xapproachesinfinity Ahhh! I see what I did wrong... thanks so much!!
Umm, do you think you can help me with one more question however, if it isn't too much to ask? ;w;

Answer 9

you are welcome! post and i will see if i can

Answer 10

@xapproachesinfinity
Okay! Thanks so much! XD
Okay this for this one, since the equation is different than the one from my last question, I wasn't sure if the quadratic formula could still be applied to it >.< But here it is!

Solve 3x2 = -12x - 15.

Answer 11

that basically the same thing
you have 3x^2=-12x-15
you add 12x to both sides you have 3x^2+12x=-15
then add 15 to both sides you get 3x^2+12x+15=0
then solve

Answer 12

@xapproachesinfinity Ah! I see >.< Am I still supposed to multiply the -1 out? Or is it okay?

Answer 13

OF course not! i did that to get rid of - sign
but when you a good expression you don't have to
notice that whether i took that sign off or not i will get the same results
i just preferred to make it nice

Answer 14

XD Okay!

Answer 15

Okay, is this correct so far? :x

Answer 16

yes good!