__Example 4__

Given the function $f:x\mapsto 3x+2$ , find the value of

(a) $f(2)$

(b) $f(-5)$

(c) $f\left(\frac{1}{3}\right)$

__Example 5__

If $f(x)={x}^{2}+3x+2$ , express each of the following in terms of x:

(a) $f(2x)$

(b) $f(3x+1)$

(c) $f({x}^{2})$

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