Question

-√15•√3+(√5)2•√5
Va rog ajutați mă

Answer 1

$- \sqrt{15} \times \sqrt{3} + ( \sqrt{5} ) \times 2 \times \sqrt{5}$

$= - \sqrt{15 \times 3} + 2 \sqrt{5 \times 5}$

$= - \sqrt{45} + 2 \sqrt{25}$

$= - 3 \sqrt{5} + 2 \times 5$

$= - 3 \sqrt{5} + 10$

Answer 2

- rad 15 * rad 3 + (rad 5)^2 * rad 5 = 
= - rad5 * rad3 * rad3 + 5 * rad 5 = 
= -3 rad 5 + 5 rad 5 = 2 rad 5