quadratic equation x Pythagoras

[rugged pier]

I’ve gone wrong somewhere here. I have put these numbers into Pythagoras, factorised and simplified them, but when I get to solving n it is negative (not possible for a dimension). can someone help? Sorry for the messy work.

[grim yew]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with: ```diff
   +close

[round sphinx]

keep going

n²+12n+36 = 2n²+6n+9

You got it till here ryt?

You forgot to add the other n².

[rugged pier]

ohhh

yes

that’s what happened

thank you very much

[round sphinx]

Keep practising. You'll improve.
:))

[rose dome]

+close