what is this identity answer
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Step-by-step explanation:
(a-b )⁴ = [ (a-b )²]² = ( a²+ b² - 2ab )²= (a² + b² - 2ab ) × (a² + b² - 2ab )
= a² ( a² + b²-2ab ) + b²(a²+ b² - 2ab ) - 2ab(a² + b² - 2ab )
= a⁴ + a²b² - 2a³b + a²b² + b⁴ - 2ab³ - 2a³b - 2ab³ + 4a²b²
= a⁴ + b⁴ - 4a³b - 4ab³ + 4a²b² is the answer.
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