Question

expand the following :
1. (a + b)^3
2. (a - b)^3
thank.......
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Answer 1

a^3 + b^3 + 3 ab(a +b)
a^3 - b^ 3 - 3 ab( a-b)

Answer 2

${(a + b)}^{3} = {a}^{3} + {b}^{3} + 3 {a}^{2} b + 3a {b}^{2}$
${(a - b)}^{3} = {a}^{3} - {b}^{3} - 3 {a}^{2} b + 3a {b}^{2}$