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Given expression is
Let assume that
On squaring both sides, we get
Thus,
Hence,
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More Identities to know :
➢ (a + b)² = a² + 2ab + b²
➢ (a - b)² = a² - 2ab + b²
➢ a² - b² = (a + b)(a - b)
➢ (a + b)² = (a - b)² + 4ab
➢ (a - b)² = (a + b)² - 4ab
➢ (a + b)² + (a - b)² = 2(a² + b²)
➢ (a + b)³ = a³ + b³ + 3ab(a + b)
➢ (a - b)³ = a³ - b³ - 3ab(a - b)
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