Question

5x2 + 17x = –6

Answer 1

add 6 to both sides:
5x^2 + 17x + 6 = 0
Now just use the discriminant formula to figure this out.

Answer 2

you don't need a formula x= -16/17 or -0.94117647
unless there's something i'm missing

Answer 3

how did you get that??

Answer 4

I did 5x2 equals 10 then I subtracted that from both sides which equaled up to
17x=-16 then I divided by 17 to get x all by itself and what you do to one side you do to the other so I divided -16 by 17 and got x= -16/17 or -0.94117647

Answer 5

I used the quadratic formula and got a very different answer. Would you like me to post it?

Answer 6

I would genuinely appreciate the help... again lol

Answer 7

It is factorable, but as I said before, sometimes factoring is just not worth the hassle.

\[x= \frac{-b \pm \sqrt{b^2-4ac}}{2a}\]
\[x= \frac{-17 \pm \sqrt{17^2-4(5)(6)}}{2(5)}\]

Answer 8

All I did was plug in the values for a,b and c.

Answer 9

Sabot3 are you working on the quadratic formula because if so then yea use that but if your just doing basic math then there's no point in making things complicated. What math class/ grade are you in?

Answer 10

This is beginning algebra

Answer 11

@ispike if you can help @Sabot3 find an easier way to factor, I'm sure he would appreciate it (And so would I), I use the quadratic formula when factoring gets to be too frustrating.

Answer 12

@gypsy1274 you're the freakin BEST

Answer 13

Thanks.
In beginning Algebra, you probably haven't seen the quadratic formula yet. Are you able to solve it?

Answer 14

no

Answer 15

the quadratic formula is used for graphing so I don't see how it would work in a normal equation. If it works for you that's fine and I don't think Sabot3 should use it until he's learned it. Also I know that my answer is correct.

Answer 16

@ispike The original question should look like this:\(5x^2 + 17x = –6\). Does that change your answer?

Answer 17

Well yea because the one I saw was 5x2 not 5^2

Answer 18

One step at a time:
Look at the denominator.
2(5) = 2*5=10

Answer 19

@ispike You will see that alot on here. Most people don't know how to type equations.

Answer 20

How do you know that it's 5^2 because he never said that someone else did

Answer 21

it is 5x^2, my apologies

Answer 22

@ispike, I usually ask to clarify, but this time I made an assumption.
@Sabot Just do the operations that you can. Start with the multiplications.

Answer 23

\[x= \frac{-17 \pm \sqrt{17^2-4(5)(6)}}{10}\]
The next thing I would do is multiply -4 * 5 * 6

Answer 24

Use a calculator, these numbers get pretty big.

Answer 25

@Sabot3 Let me know what you get for each of the calculations and I'll rewrite the equation and give you the next step.

Answer 26

okay