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A2 binomial expansion question

I've been checking my working for an hour now and can't find my mistake - i guess it must be a systematic error, can someone help me figure out where i went wrong for part b below please?
Thank you

(edited 2 years ago)

Reply 1

mqb2766

near the start
(-1)^2 = -1
?

Reply 2

Rhys_M

Original post by mqb2766

near the start
(-1)^2 = -1

Oh shoot. Its -1^-2 but that gives the same - i did it all on my calc, must've forgotten brackets. Moron.
Thank you

Reply 3

mqb2766

Tbh, as the constant term is wrong, you could have just subbed x=0 into each expression and worked out where the error was. Should only have taken a few minutes.

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A2 binomial expansion question

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