Question

VA ROG SA MA AJUTAȚI!!!​

Answer 1

$\boxed {24._{\boxed {a)}} }$    $\left(\sqrt{2}-1\right)\left(\sqrt{3}+1\right) =$

$\\\boxed{\left(a+b\right)\left(c+d\right)=ac+ad+bc+bd}$

$=\sqrt{2}\sqrt{3}+\sqrt{2}\cdot \:1-1\cdot \sqrt{3}-1\cdot \:1$

$=\sqrt{6}+\sqrt{2}-\sqrt{3}-1$

$\boxed {b)}$  $3\left(3-\sqrt{5}\right)+2\left(1+\sqrt{5}\right) =$

$=9-3\sqrt{5}+2\left(1+\sqrt{5}\right)$

$=9-3\sqrt{5}+2+2\sqrt{5}$

$=11-3\sqrt{5}+2\sqrt{5}$

$=11-\sqrt{5}$

Sper ca te-am ajutat!

Succes!