Let h(x) be a differentiable function on R. Use MVT to find an upper bound for h(1998) if h(-2) = 2 and h'(x) is at most 1 for all x in R.

Given : $h\left(x\right)$ be a differentiable function on $\mathrm{ℝ}$ and $h(-2) = 2$ and $h\text{'}\left(x\right)$ is at most $1$ for all $x$ in $\mathrm{ℝ}$.

To find : The upper bound for $h\left(1998\right)$ by using Mean Value Theorem.