| f'(x) | = | lim h  0 |
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According to the procedure box above, you obtain the derivative by evaluating
| f'(x) | = | lim h 0 |
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Now, we have already calcuated the expression
 f(x) h | = 6x + 4 + 3h |
in the last question. What we must now do is take the limit as h approaches 0. That is, we calculate what 6x + 4 + 3h is approaching as h gets smaller and smaller. But all that happens is that 3h also becomes smaller and smaller, so that the limit is
Enter this as 6*x + 4
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