Question

se a³+b³= 20 e a²b+ab²=5 o valor de (a+b)³ é

Answer 1

${(a + b)}^{3} = {a}^{3} + {b}^{3} + 3{a}^{2} b + 3a {b}^{2} \\ {(a + b)}^{3} = 20 + 3( {a}^{2} b + 3a {b}^{2} ) \\ {(a + b)}^{3} = 20 + 3 \times 5 = 35$