Question

Cho hàm số y = f(x) = x2 - 2. Hãy tính f(2) ; f(1) ; f(0) ; f(-1) ; f(-2)

Answer 1

\(f\left(2\right)=f\left(-2\right)=\left(-2\right)^2-2=4-2=2\)

\(f\left(1\right)=f\left(-1\right)=\left(-1\right)^2-2=1-2=-1\)

\(f\left(0\right)=0^2-2=0-2=-2\)

Answer 2

Ta có: y=f(x)=x2−2y=f(x)=x2−2

Thay $x=2;1;0;-1;-2$ vào hàm số ta được:

f(2)=22−2=4−2=2f(2)=22−2=4−2=2

f(1)=12−2=1−2=−1f(1)=12−2=1−2=−1

f(0)=02−2=−2f(0)=02−2=−2

f(−1)=(−1)2−2=1−2=−1f(−1)=(−1)2−2=1−2=−1

f(−2)=(−2)2−2=4−2=2f(−2)=(−2)2−2=4−2=2