If a + b = 5 and ab = 3, then (a^3 + b^3) is equal to :

SSC CHSL Model Paper 15

Question : 64 of 100

Marks: +1, -0

a + b = 5

and

ab = 3

, then

(a^3 + b^3)

is equal to :

Solution:

a^3 + b^3

= (a + b)^3 - 3ab (a+ b)

= (5)^3 -3×3×5

= 125-45 = 80

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