This question is about calculus.

f(x + h)- f(x)/h

Given

f(x) = 2x + 5

f(x + h) would mean adding h to wherever there's an x.

Therefore;

f(x + h) = 2(x + h) + 5

f(x + h) = 2x + 2h + 5

Next, we'd solve f(x + h)- f(x)/h

= [(2x + 2h + 5) - (2x + 5)] / h

= (2x + 2h + 5 - 2x - 5) / h

= (2x - 2x + 2h + 5 - 5) / h

= (0 + 2h + 0) / h

= (2h) / h

= 2

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