Question

coefficient of x2 in binomial expansion of (1-x)2 is​

Answer 1

Answer:

Answer is 2

Step-by-step explanation:

(1-x)2= 1-1x+x2

Answer 2

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• GiveN :

$\mapsto \sf \: (1 - x)^{2}$

• To FinD :

$\sf \mapsto \: coefficient \: \: of \: \: {x}^{2}$

• SolutioN :

Binomial Expression,

$\implies \sf \: {(1 - x)}^{n} = \sum \: ^nC_r \: ( {1})^{r} \: \: ( {x})^{n - r}$

$\implies \sf \: {(1 - x)}^{2} = {1}^{2} + {x}^{2} - 2x$

Hence,

coefficient of x² is -1

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