Question

factorise a³ -9b³+(a+b)³​

Answer 1

${a}^{3} - 9 {b}^{3} + (a + b) {}^{3}$

Using Identity

$(x + y) {}^{3} = {x}^{3} + 3 {x}^{2} y + 3x {y}^{2} + {y}^{3}$

${a}^{3} - 9b {}^{3} + {a}^{3} + 3 {a}^{2}b + 3a {b}^{2} + {b}^{3}$

$2a - 8 {b}^{3} + 3 {a}^{2}b + 3a {b}^{2}$

hope it helps you........

Answer 2

Answer:

2a-8b³+3a²b+3ab² is your answer

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