Question

simplify: (a+3b)³-(a-3b)³​

Answer 1

Answer:

$(a + 3b {)}^{3} - (a - {3b)}^{3} \\ = ({a}^{3} + 27 {b}^{3} + 3( {a}^{2}) (3) + 3(a)( {3}^{2} )) - ({a}^{3} - 27 {b}^{3} - 3( {a}^{2}) (3) + 3(a)( {3}^{2} )) \\ = {a}^{3} + 27 {b}^{3} + 9 {a}^{2} + 27a - {a}^{3} + 27 {b}^{3} + 9 {a}^{2} - 27a \\ = 52 {b}^{3} + 18 {a}^{2}$

Answer 2

Answer:

look in the you ll get some idea.