Question

05. Dada a função f: A ⊂ ℝ → B ⊂ ℝ tal que f(x) = x² - 2x - 2, determine:
a) D(f).
b) f(0), f(-2),f(3/5)e f(-4/7).

Answer 1

a) D(f)= é o conjunto dos números reais

b)f(0)=0²-2.0-2=-2
f(-2)=(-2²)-2.-2-2=6
f(3/5)=(3/5)²-2.3/5-2=9/25-6/5-2=105/125-2=105-250/125=-1,16
f(-4/7)=(-4/7)²-2.-4/7-2=16/49+8/7-2=504/343-2=-182/343