Question

f(x)=x elevado a 2 -5x+4

Answer 1

f(x)= x . 2 ^ -x 

f(1) = 1 * 2 ^ -1 
f(1) = 1 * 1/2 
f(1) = 1/2 

f(1/2) = 1 * 2 ^ -1/2 
f(1/2) = 1 * 1/2 ^ 1/2 
f(1/2) = 1 * √1/2 

................................. 

2.f(1) = 2 * 1/2 = 2/2 = 1 

4.f(1/2) = 4 * 1 * √1/2 = 4√1/2 = 2²√1/2 = 2² * 2 ^ -1/2 = 2 ^ 3/2 

.................................... 

2.f(1)+4.f(1/2) = 1 + 2 ^ 3/2 = 1 + √2^3 = 1 + √2² * √2 = 1 + 2 √2 


1 + 2 √2 

Resposta: d) 1+2 raíz de 2