Question

Maths class 9 plss fast

Answer 1

a²+1/a²-18

(splitting the number -18)

=a²+1/a²-2-16

=(a²+1/a²-2)-16

=(a²+1/a²-2*a*1/a)-(4)²

=(a-1/a)²-(4)²

using the identity a²-b²=(a+b)(a-b)

=(a-1/a+4)a-1/a-4)

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