Question

use the quadratic formula to solve
x^2+3x-5=0

Answer 1

the constant in front of the x^2 is a the constant in front of x is b and the constant is c
from here -b(+/-)sqrt(b^2-4ac)/2a

Answer 2

so you have two solutions (-3+sqrt(3^2-4*1*5))/(2*1)

Answer 3

and (-3-sqrt(3^2-4*1*5))/(2*1)

Answer 4

The number in the sqrt is negative so you have a non-real answer

Answer 5

@hera474 has the right answer, but the equation is a little hard to read so I'll rewrite it using the equation tool:\[x = \frac{ -b \pm \sqrt{b ^{2} - 4ac} }{ 2a }\]

Answer 6

@tcarroll010 Thanks i didn't know I could do that :)

Answer 7

thank you all bout i solved and got -1.925 is that right?

Answer 8

Have you learned about imaginary numbers yet?

Answer 9

The equation tool is handy, useful, and fun. It uses LatX document preparation language and it sets that up all behind the scenes. I suggest to anyone to experiment with it.

Answer 10

It's either no solution or you have to give it in complex for.

Answer 11

And this problem does not have imaginary numbers for the solution because "a" and "c" have opposite signs. Whenever you have that, you get real solutions.

Answer 12

Wow... That was stupid of me.

Answer 13

The number in the radical will be positive. It was not stupid of you, it was just an oversight. Everyone does that from time to time. Keep up with your explanation, you're doing fine. You just went slightly off for a second.

Answer 14

can someone help me solve this ?

Answer 15

a=1, b=3, and c=-5, so start by substituting those values into the formula you were given by us. The a, b, and c come from:

ax^2 + bx + c = 0

so you might want to first match those a, b, and c up from your equation to see where we got those from.

Answer 16

So, @bri4life14 , you have been given some good help here. Where do you stand with your work on this? Show us some of your work now.

Answer 17

Dang this equation thing takes a while

Answer 18

im stuck :( i put everything into the formula but i dont know where to start

Answer 19

\[(-3-\sqrt{3^2-4*1*-5})/(2*1)\] and \[(-3+\sqrt{3^2-4*1*-5})/(2*1)\]

Answer 20

\[(-3+\sqrt(9+20))/2\] and \[(-3-\sqrt(9+20))/2\]

Answer 21

You can get the answer if you plug it into a calculator.

Answer 22

Do you understand it now?

Answer 23

yes im trying to do this with you ....how did u get 9

Answer 24

3 squared is 9

Answer 25

oh sorry and i got -5.692

Answer 26

you should get two answers one from each equation.