factorise 8a^-12a^b+6ab^
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Answer:
= (2a)³+ (b)³+ 12a²b+ 6ab²
= (2a)³+ (b)³+ 6ab (2a+b)
= (2a)³+ (b)³+ 3 (2a) (b) (2a+b)
{using (x+y)³ = x³+ y³+ 3xy (x+y)
putting x = 2a, y = b}
= (2a+b)³
= (2a+b) (2a+b) (2a+b)
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