Factorise : (a+b) (a-b) - ( a-b).
Pls give all the steps.
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Step-by-step explanation:
Factorise : (a+b) (a-b) - ( a-b).
= a³ + b³ + 3a²b + 3ab²+ a³ - b³ - 3a²b+ 3ab²
= 2a³+6ab² = 2a(a²+3b²)
2a(a²+3b²)
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