Factorise
64x^6y^6-72x^4y^6
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Solution :
64x^6y^6 - 72x⁴y^6
= 8x⁴y^6 × 8x² - 8x⁴y^6 × 9
= 8x⁴y^6( 8x² - 9 )
= 8x⁴y^6 [ (2√2x)² - 3² ]
= 8x⁴y^6( 2√2x + 3 )( 2√2x - 3 )
••••
64x^6y^6 - 72x⁴y^6
= 8x⁴y^6 × 8x² - 8x⁴y^6 × 9
= 8x⁴y^6( 8x² - 9 )
= 8x⁴y^6 [ (2√2x)² - 3² ]
= 8x⁴y^6( 2√2x + 3 )( 2√2x - 3 )
••••
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