Question

PLEASE HELP, easy.
What are the exact solutions of x^2-5x-7=0 ?

Answer 1

This does not factor.

Answer 2

does no factor

Answer 3

I know, u have to use the quadratic formula

Answer 4

use formula\[-b \pm \sqrt{b^2-4ac} \over 2a\]

Answer 5

But I mess up on it I can't do it!!

Answer 6

Cool, use the formula then =)

Answer 7

Alright I'll try :)

Answer 8

you need to know a,b, and c
a=1
b=5
c=7
Now substitute this into the quadratic formula and solve

Answer 9

Okay thanks guys

Answer 10

@aussy123 b=-5 and c=-7

Answer 11

Oh they are negative?

Answer 12

Yes. b and c are negative.

Answer 13

Thnx

Answer 14

so,\[5 \pm \sqrt{25+28} \over 2\]after solving these make two roots on as\[\alpha=\frac{-b + \sqrt{b^2-4ac}}{2a}\] & second as\[\beta=\frac{-b -\sqrt{b^2-4ac}}{2a}\]

Answer 15

@SmartWish Thanks for the correction

Answer 16

So wait

Answer 17

You get 53 over 2

Answer 18

@aussy123

Answer 19

Im checking now

Answer 20

use quasratic equation

Answer 21

Oh got it

Answer 22

use quadratic equation
-b ± √b²-4ac
x=------------------
2a
a=1
b=-5
c=-7
put them in above equation

Answer 23

\[\frac{5\pm \sqrt{53}}{2}\]

Answer 24

there was a typo mistake correct is as below

Answer 25

Thanks guys appreciate it