factorise a(a+b)³-3a²b (a+b)
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→ a(a + b)³ - 3a²b(a + b)
→ a(a³ + b³ + 3a²b + 3ab²) - 3a³b - 3a²b²
→ a⁴ + ab³ + 3a³b + 3a²b² - 3a³b - 3a²b²
→ a⁴ + ab³
→ a(a³ + b³) __________(Ans.)
Hope it helps..
^__°
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