Question

If a+ 1/a = 4 then, a^3 + 1/a^3 is?

Answer 1

Answer:

52

Step-by-step explanation:

(a+1/a)^3=(4)^3

by formula..... (a+b)^3=a^3+b^3+3ab(a+b)

so, (a+1/a)^3=64

or, a^3+1/a^3 +3a. 1/a(a+1/a)=64

or,. a^3+1/a^3 +3(4)=64. ..... [ a+1/a is given 4 ]

or, a^3 +1/a^3 +12=64

or, a^3+1/a^3 =64-12

or , a^3+1/a^3=52

.......... please follow me