Question

if ab=5 and a-b=2, then what is the value of a^3 -b^3​

Answer 1

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Hey Mate!!

According to the formula,

a³ - b³ = (a - b)(a² - ab - b²)

=> a³ - b³ = (2)(a² - 5 - b²)

=> a³ - b³ = 2a² - 10 - 2b²