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Can you show me?

have you heard of the Newton-Raphson method?

if you have, then that will converge to the answer faster.

Actually no I havent

no worries - just use one (or more) of the techniques mentioned above to see which one you prefer.

Thank you so much =D

yw :)

you won't find an exact answer - you are supposed to find the nearest answer to one tenth

Yeah and I think you have to round it at the end right?

ok, let me try and explain. we said we can re-arrange the question to this form:\[b^2+18b=1\]

does that make sense?

It makes sense till so the "closest" answer is when b=0.1
and then how did it become 9.1?

because we started this from:\[(9+b)^2=82\]now we have found 'b', answer is '9+b'

This is even more complicated lol but yeah i understood how =) Thank youu!!

Afwan :)