RRB Assistant Loco Pilot and Technician Model Paper 16 with key

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Question : 42 of 75

Marks: +1, -0

If

a/b+b/a

= 1 , a ≠ 0 , b ≠ 0 the value of

a^3+b^3

is :

0
1
- 1
2

Solution:

a/b+b/a

= 1
⇒

{a^32+b^2}/{ab}

= 1
⇒

a^2+b^2

- ab = 0

a^3+b^3

= (a + b) (

a^2-ab+b^2

)
⇒

a^3+b^3

= (a + b) × 0
⇒

a^3+b^3

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