Question

Calcule o valor de B, sabendo-se que:
B= (√5+√3) * (√5- √3)

a-) B=2
b-) B=√34
c-) B=2+√15
d-) B=8+√15​

Answer 1

$\Large\boxed{\begin{array}{l}\sf B=(\sqrt{5}+\sqrt{3})\cdot(\sqrt{5}-\sqrt{3})\\\sf B=(\sqrt{5})^2-(\sqrt{3})^2\\\sf B=5-3\\\sf B=2\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~a}}}}\end{array}}$