\[
f(x)=\left\{\begin{array}{ll}
3 x+a & x \geq 3 \\
x^{2}-b & x< 3
\end{array}\right.
\]
\( . a, b \in R \quad \) ، \( \quad \) f \( f(\sqrt{2})=5 \) موجودة وأن \( \lim _{x \rightarrow 3} f(x) \) وكانت
\(a = 3\)
Step 1 :\(f(\sqrt{2}) = (\sqrt{2})^2 - b = 2 - b = 5\)
Step 2 :\(b = -3\)
Step 3 :\(f(3) = 3(3) + a = 9 + a \)
Step 4 :\(\lim _{x \rightarrow 3} (x^2 - b) = 3^2 - (-3) = 12 \)
Step 5 :\(a = 3\)