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Question
Let f(x) = 2x + 5. If x ≠ 0 then find `(f(x + 2) -"f"(2))/x`
Solution
f(x) = 2x + 5
f(x + 2) = 2(x + 2) + 5
= 2x + 4 + 5
= 2x + 9
f(2) = (2) + 5
= 4 + 5
= 9
`(f(x + 2) -"f"(2))/x = (2x + 9 - 9)/x`
= `(2x)/x`
= 2
`(f(x + 2) -"f"(2))/x = 2`
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