Question

tell the ans with explaination​

Answer 1

Answer:

(B) 20

Step-by-step explanation:

$x+\frac{1}{x}=-2\\\\x^{2} +1=-2x\\\\x^{2} +2x+1=0\\\\(x+1)^{2}=0\\x+1=0\\x=-1\\\\x^{96}-x^{95}+x^{86}-x^{85}+...x^{6}-x^{5} \\\\= (x^{96}+x^{86}+...x^{6})-(x^{95}+x^{85}+...x^{5})\\from \ 96 \ to \ 6 \ there \ are \ 10 \ values \ because \ the \ gap \ is \ 10 \ . \ from \ 95 \ to \ 5 \ there \ are \ 10 \ \ values \ as \ well \ .$

-1 to the power even number is +1

-1 to the power odd number is -1

=( +1 × 10) - ( -1 × 10)

=10-(-10)

=20