## anonymous 5 years ago when completing the square r^2-4r=30 the answer would be r=-3.8 and r=7.8 right

1. anonymous

Yes. But I prefer: $r = 2 \pm \sqrt{34}$ Because inexact answers make me retch.

2. anonymous

No, it's 4. 1/2(b)^2 B is -4, so divide by 2 you get 2, and squared is 4.

3. anonymous

no i mean the final answer

4. anonymous

Oooh sorry didn't see the 30

5. anonymous

6. anonymous

$2 + \sqrt{34} \approx 7.8$ $2 - \sqrt{34} \approx - 3.8$

7. anonymous

OH OK THANK YOU SO IT IS RIGHT

8. anonymous

Yes.

9. anonymous

THANK YOU