## JaneDoe100 2 years ago help! use the quadratic formula to solve x²+3=-4x

1. gerryliyana

x^2+4x+3 = 0 (x+1) (x+ 3) = 0 then x = -1 or x = -3

2. rizwan_uet

no no use quadratic formula to solve @gerryliyana

3. diongory

do you know what the quadratic formula is? or are you asking for that.

4. JaneDoe100

i know what it is but i still dont know how 2 get the answer...

5. diongory

set up equation so that you have: ax^2+bx+c=0 and use a, b and c correctly in your formula

6. JaneDoe100

x²+4x+3=0?

7. diongory

so a=?,b=?, and c=?

8. gerryliyana

yess ur all right

9. gerryliyana

smart boy!!

10. JaneDoe100

a=o b=4 c=3

11. gerryliyana

nooo

12. gerryliyana

a = 1, b=4, c=3

13. gerryliyana

yes

14. JaneDoe100

sorry i wasnt thinking

15. JaneDoe100

so now what?

16. gerryliyana

use $x = \frac{ -b \pm \sqrt{(b^{2} - 4ac)} }{ 2a }$

17. gerryliyana

substitute all parameter, including a, b, and c

18. gerryliyana

to solve x²+4x + 3 =0 you should find the value of x, one way to do this by using formula above ...,

19. gerryliyana

$x = \frac{ -b \pm \sqrt{b^{2}-4ac} }{ 2a }$ $x = \frac{ -4 \pm \sqrt{4^{2}-(4)(1)(3)} }{ 2(1) }$

20. JaneDoe100

ok

21. JaneDoe101

Thanks both of you!