Question

when completing the square
r^2-4r=30
the answer would be r=-3.8 and r=7.8 right

Answer 1

Yes. But I prefer:

\[r = 2 \pm \sqrt{34} \]

Because inexact answers make me retch.

Answer 2

No, it's 4.

1/2(b)^2

B is -4, so divide by 2 you get 2, and squared is 4.

Answer 3

no i mean the final answer

Answer 4

Oooh sorry didn't see the 30

Answer 5

so is my answer right

Answer 6

\[2 + \sqrt{34} \approx 7.8 \]
\[2 - \sqrt{34} \approx - 3.8 \]

Answer 7

OH OK THANK YOU SO IT IS RIGHT

Answer 8

Yes.

Answer 9

THANK YOU