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Q. x⁴ - 81
= x⁴ - (3) ⁴ { 3×3×3×3 = 81}
= ( x²) ² - (3²) ² [ a²-b² =( a+b ) (a-b) ]
= ( x² - 3²) (x² + 3²) [ a²-b² =( a+b ) (a-b)]
= ( x + 3) (x - 3) (x² + 3²)
H O P E T H I S H E L P S Y O U : - )
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