factorise 5(3x+y)²+6(3x+y)-8
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Now, 5 (3x + y)² + 6 (3x + y) - 8
= 5 (3x + y)² + 10 (3x + y) - 4 (3x + y) - 8
= 5 (3x + y) (3x + y + 2) - 4 (3x + y + 2)
= (3x + y + 2) (15x + 5y - 4),
which is the required factorization.
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