Question

Ayuda por favor.....<3​

Answer 1

Explicación paso a paso:

1) $- \sqrt{3} ( \sqrt{15} - \sqrt{30} )$ =  $-\sqrt{45} + \sqrt{90} =$ $- 3 \sqrt{5} + 3\sqrt{10}$

2) ($(\sqrt{7} - \sqrt{5} ) ( \sqrt{7} + \sqrt{5} ) =$ $(\sqrt{7})^{2} - (\sqrt{5} )^{2} =$ $7 - 5 = 2$

3) $(\sqrt{10} + \sqrt{6})^{2} =$  $(\sqrt{10})^{2} + 2 \sqrt{10} \sqrt{6} +(\sqrt{6})^{2} =$ $10 + 2 \sqrt{60} + 6$ = $16 + 4\sqrt{15}$

4)

$(\sqrt{20} - 3 ) (\sqrt{5} + 8) = \sqrt{100} + 8 \sqrt{20} - 3\sqrt{5}- 24 = 10 + 16\sqrt{5} - 3 \sqrt{5} - 24 =$

= $-14 + 13 \sqrt{5}$