Question

Daca a=√12 si b=√27,calculati a·b

Answer 1

$a = \sqrt{12}\\b = \sqrt{27} \\ \\ a\cdot b = \sqrt{12}\cdot \sqrt{27} = \sqrt{12\cdot 27} =\\ \\ = \sqrt{4\cdot 3\cdot 3\cdot 9} = \sqrt{2^2\cdot 3^2\cdot 3^2} = 2\cdot 3\cdot 3 = \boxed{18}$