SSC CGL 11 Jun 2019 Shift 1 Paper

Question : 71 of 100

Marks: +1, -0

If a + b = 5 and ab = 3, then

(a^3 + b^3)

is equal to:

Solution:

a^{3}+b^{3}=(a+b)\ \{(a+b)^{2}-3 a b\ \}

=5 \×\ \{5^{2}-3 \×3\ \}

=5 \×16=80

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