just plug in the values:
f(x) = 4x+3
f(x+h) = 4(x+h)+3
f(x+h)-f(x) = (4x+4h+3) - (4x+3) = 4h
(f(x+h) - f(x))/h = 4h/h = 4
4x-1 / 2x^2+3
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