factorise no 30 the image is clear so pl ans fast
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= 9a² + 3a - 8b - 64b²
= 9a² - 64b² + 3a - 8b
= (3a)² - (8b)² - ( 3a + 8b )
Using identity { a² - b² = ( a + b ) ( a - b ) }
= ( 3a + 8b ) ( 3a - 8b ) - ( 3a + 8b )
= ( 3a + 8b ) ( 3a - 8b - 1 ).
= 9a² - 64b² + 3a - 8b
= (3a)² - (8b)² - ( 3a + 8b )
Using identity { a² - b² = ( a + b ) ( a - b ) }
= ( 3a + 8b ) ( 3a - 8b ) - ( 3a + 8b )
= ( 3a + 8b ) ( 3a - 8b - 1 ).
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