Question

Expand=(x+y)3. reply fast
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Answer 1

Given : -

• (x + y)³

Solution

Apply identity : (a + b)³ = a³ + b³ + 3ab(a + b)

→ (x + y)³

→ (x)³ + (y)³ + 3 × x × y(x + y)

→ x³ + y³ + 3xy(x + y)

→ x³ + y³ + 3x²y + 3xy²

Some Identities

• (a + b)² = a² + b² + 2ab
• (a - b)² = a² + b² - 2ab
• a² - b² = (a + b)(a - b)