Question

calcule: (√201 + √199) x ( √201 + √199 )

Answer 1

(√400) x (√400)
20 x 20
=400

Answer 2

Resposta:

$\left(\sqrt{201}+\sqrt{199}\right)\left(\sqrt{201}-\sqrt{199}\right)\\\\\mathrm{Aplicar\:a\:regra\:da\:diferenca\:de\:quadrados:\:}\left(a+b\right)\left(a-b\right)=a^2-b^2\\\\\left(\sqrt{201}\right)^2-\left(\sqrt{199}\right)^2\\\\\left(\sqrt{201}\right)^2-\left(\sqrt{199}\right)^2=2\\\\=2$