Question

If a square + b square = 5 , ab = 2 find a cube - b xube

Answer 1

Answer:

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Answer 2

Answer:

a^2 +b^2 = 5

ab=2

(a-b)^2 =a^2 +b^2 - 2ab

=5 - 4

= 1

now, (a - b)^2 = 1

a-b = 1

a^3 - b^3=(a-b)(a^2+b^2+ab)

=1(5+2)

=7

hence a^3 - b^3= 7