Question

sqrt20-sqrt45+sqrt5-sqrt80

Answer 1

20^(1/2) - 45^(1/2) + 5^(1/2) -80^(1/2)=

2*(5)^(1/2) -3*5^(1/2) +5^(1/2) -4*5^(1/2)=

-(5)^(1/2) +5^(1/2) -4*5^(1/2)=-4*5^(1/2)= -8,944271909999159 aproximadamente