Factorise 63a2 – 112b2 with solution
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63a² – 112b²
( 7 × 3 × 3 × a × a ) - ( 2 × 2 × 7 × 2 × 2 × b × b )
7 ( 9a² - 16b²)
7 [ ( 3a ) ² - ( 4b )² ]
7 ( 3a + 4b ) ( 3a - 4b)
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