RRB Junior Engineer Stage 1 Model Papers 10

Question : 7 of 98

Marks: +1, -0

If a = 4.965, b = 2.343 and c = 2.622, then the value of

a^3-b^3-c^3-3abc

Solution:

a = 4.965 ≈ 5, b = 2.343 ≈ 2 c = 2.622

a – b = c

taking cube both sides

a^3– b^3– 3a^2b + 3ab^2= c^3

a^3-b^3-c^3-3ab(a-b)=0

a^3-b^3-c^3-3abc=0

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