## anonymous one year ago Solve this quadratic equation using the quadratic formula. x2 + 8x - 5 = 0

1. pooja195

List your A,B,C values keeping this in mind $\huge~\rm~ax^2+bx+c=0$

2. anonymous

$\frac{ -8\pm \sqrt{(8)^{2}-4(1)(5)} }{ 2(1) }$

3. jigglypuff314

don't forget about the minus sign (negative) in front of that 5 :)

4. anonymous

thanks

5. GreenCat

Perfect @gizmo25 Now simplify. $\frac{ -8 \pm \sqrt{64-20} }{ 2 }$$\frac{ -8 \pm \sqrt{44} }{ 2 }$Oops; I was about to solve it all for you. Can you work it out from here? Hint: Pull out what you can from the square root.

6. jigglypuff314

@GreenCat note that I just mentioned the negative so it should be a 64 + 20 instead :)

7. GreenCat

oh yes; it is (-5). Sorry.

8. GreenCat

I was working from Gizmo's equation. @gizmo25 Remember to include the negative in "-5" there.

9. GreenCat

$\frac{ -8 \pm \sqrt{64+20} }{ 2 }$$\frac{ -8 \pm \sqrt{84} }{ 2 }$Here You go.

10. anonymous

thanks :)