Question

raiz de 80 menos raiz de 20 sobre 2​

Answer 1

$( \sqrt{80} - \sqrt{20} ) { }^{2} = ( \sqrt{4 {}^{2} \times 5 } - \sqrt{2 {}^{2} \times 5} ) {}^{2} =(4 \sqrt{5 } - 2 \sqrt{5} ) { }^{2} = (2 \sqrt{5} ) {}^{2} = 2 { }^{2} \times 5 = 20$