Question

Ajutatima va rog
(3√5+1)la cub

Answer 1

(3√5+1)³=135√5+135+9√5+1=144√5+136

Answer 2

$(3\sqrt5+1)^3 =\\ \\ = (3\sqrt5+1)\cdot (3\sqrt5+1)^2 = \\ \\ = (3\sqrt5+1)\cdot \Big((3\sqrt5)^2+2\cdot 3\sqrt5\cdot 1+1^2\Big) = \\ \\ = (3\sqrt5+1)\cdot (45+6\sqrt5+1) = \\ \\ = (3\sqrt5+1)\cdot (6\sqrt5+46) = \\ \\ = 18\cdot 5+138\sqrt5+6\sqrt5+46 = \\ \\ = 90+46+144\sqrt5 = \\ \\ = 136+144\sqrt5$