Binomial Expansion finding the constant term

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Thank you. Somehow you are the only person on the internet that actually explained this question correctly.

epictrooper
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Can you explain what the question is asking? What does it mean by constant in a term. I’ve searched it up but it only comes up with a basic algebra definition.

kingbao
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You missed out the fact that it should be -3^4 at the end giving -90720 NOT 90720!!!

ru
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i feel stupid for missing that question on the test now.

johnr
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Thanks, even though I’m sitting British exams, not American ones

michaelhunt
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I dont understand why the (1/x)^r becomes x^-r? How did you come up with that:(:(

daniloloma
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This was so helpful
Thankyouu so much !

sanag