Question

If a+b=8, ab=5 then what is the value of a^3+b^3.

Answer 1

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ANSWER ⏬

a3+b3=(a+b)+(b+a)*ba

8*8*6

64*6

384

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Answer 2

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

8 ^3=a^3+b^3+3ab (a + b)

512-3ab (a+b) =á3 +b3

512-3x5 x8=a^+b ^3

512-120 =á3 +b^3

a^3+b^3=392. Ans