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The difference of two factors for the expression a 4 +1/a 4 -3 is a)-4 b)-2 c)2 d)4

The difference of two  factors for the expression 
a4+1/a4-3  is
 
a)-4     b)-2
c)2       d)4

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1 Answers

Harsh Patodia IIT Roorkee
askIITians Faculty 907 Points
7 years ago
a4+ 1/a4 --3
= a4+ 1/a4 – 2 – 1
= (a2 - 1/a2)2 – 1
= (a2 – 1/a2 -1)(a2- 1/a2 + 1) ( using ( a2 – b2) = (a+b)(a-b) )
Difference between the factors = (a2 – 1/a2 -1) –(a2- 1/a2 + 1)
=2 Ans.

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