Question

Let $f:R\to R$ be defined by $f\left(x\right)=\frac{x+1}{x^2+2},x\in R$.Find $f\left(7\right)$

Answer 1

We have $f\left(x\right)=\frac{x+1}{x^2+2},x\in R$.

$f\left(7\right)=\frac{7+1}{7^2+2}=\frac{8}{49+2}=\frac{8}{51}$

55)If $f=\{(1,1),(2,3),(0,-1),(-1,-3)\}$ be a linear function from the set $\{-1,0,1,2\}$ to $Z$.Find $f\left(x\right)$

We have $f\left(1\right)=1,f\left(2\right)=3,f\left(0\right)=-1,f(-1)=-3$

$\therefore f\left(x\right)=\{1,3,-1,-3\}$