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7.Binomial Theorem
normal
$(1 -x^4)^4 (1 + x)^5$ ના વિસ્તરણમાં $x^8$ નો સહગુણક મેળવો
A
$20$
B
$-32$
C
$-14$
D
$30$
Solution
${x^4}$ | ${x^1}$ |
$4$ | $4$ |
$8$ | $0$ |
So coeff. of $x^{8}$ is
$ = { – ^4}{{\rm{C}}_1} \times {\,^5}{{\rm{C}}_4} + {\,^4}{{\rm{C}}_2} \times {\,^5}{{\rm{C}}_0}$
$=-20+6=-14$
Standard 11
Mathematics