Question

Square root equation

Answer 1

\[4-\sqrt{-4+x}=x\]
I know you subtract 4
\[-\sqrt{-4+x}=-4+x\]
Then square both sides?
\[-\sqrt{(-4+x})^2=(-4+x)^2\]
Which would make it \[-(-4+x)=(-4+x)^2\]
Am I doing it right? What about that negative lingering outside the ()'s?

Answer 2

i think you made some mistake in 3rd step,if you want to square both sides you have to write \((-\sqrt{-4 + x} ~ )^{2}\)

Answer 3

Ok. I was wondering about that.

Answer 4

you said "Am I doing it right? What about that negative lingering outside the ()'s?" and i think you're true :)

Answer 5

:)

Answer 6

Thanks so much!

Answer 7

\[-4+x=16-8x+x^2\]

Answer 8

Can I simplify that to x^2-9x-20?

Answer 9

@PFEH.1999

Answer 10

oh sry

Answer 11

I think it is supposed to be a +20, my bad.

Answer 12

i was eating dinner :)

Answer 13

Go ahead! It is fine!

Answer 14

yes,correct :)

Answer 15

+20

Answer 16

and then you can solve this equation :)

Answer 17

Nice. I got x=5 and x=4
But only 4 works when you plug it in.

Answer 18

let me check it ...

Answer 19

yes 4 and 5 and again let me plug them in :)

Answer 20

yes only 4 works :)

Answer 21

any problem?

Answer 22

Thankfully I got it. Thank you soooo much!

Answer 23

you're welcome darli :)