Question

Calcule o valor da função f(x)=x ao quadrado-5x+2 para:
A- x=2/3
B- x=Raiz de 2

Answer 1

f(x) = x² - 5x + 2

A) para x = 2/3

f(2/3) = (2/3)² - 5(2/3) + 2
f(2/3) = 4/9 - 10/3 + 2
f(2/3) = (4 - 30 + 18)/9
f(2/3) = -8/9

B) para x = √2

f(√2) = (√2)² - 5(√2) + 2
f(√2) = 2 - 5√2 + 2
f(√2) = 4 - 5√2