1.

18) Evaluate (2+1)-(2-1)

Answer»

Denote √2 as "a"

(a+1)^5-(a-1)^5

=(1+a)^5+(1-a)^5

=2(1+10a²+5a^4)

=2(1+10*2+5*4)

=2(1+20+20)

=2(41)

=82



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