The expression a³ + b³ is equivalent to _____? - IQ786

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The expression a³ + b³ is equivalent to _____?

The expression a³ + b³ is equivalent to _____?

(a + b) (a-b)(a-b)

(a + b)³ - 3ab (a+b)

(a + b)³ - ab(a+b)

None of these

Explanation

a³ + b³ = (a + b)(a² - ab + b²) = (a + b)³ - 3ab(a + b)