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f(x+h) means you put an x+h in for every x you see.
f(x+h) = 2(x+h) - 3
Subtract f(x) from that. f(x) is the original problem.
f(x+h) - f(x) = 2(x+h) - 3 - (2x -3)
f(x+h) - f(x) = 2x + 2h - 3 - 2x + 3
That's just 2h.
Finally, divide by h. That's 2.
Please let me know if you need any clarification. I'm always happy to answer your questions.
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