Math Help! For the following functions, evaluate and simplify the expression-------------> f(x+h)-f(x)/h:?

Question

1) f(x)=2x-3

2) f(x)=x^2+5x-1

3) f(x)=1/x

4) f(x)=7-3x^2

5) f(x)=4x^2-3x+5

Answer 1

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Q1

f(x)=2x-3

f(x+h)=2(x+h)-3=>f(x+h)=2x+2h-3

1)   f(x+h) - f(x)/h=2(x+h)-3-(2x-3)/h

=2x+2h-3-2x+3/h

=2h/h=      2 ans