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**walk_in_fark** Hello, I had a few questions that I completed and I'm unsure if my answers are correct. i had to find the derivative of the √2x, using first principle, f(a+h) - f(a)/h. The answer that I arrived at is 1/√2√x, but when i use the power rule i get 1/x^2. Are they both wrong, or am i doing something wrong, somewhere? The second question is finding the derivative of 3x/(x^2 + 4), the answer i arrived at, is 3/x^2 + 4 - 6x^2/(x^2 + 4)^2. I got this using the quotient rule. Sorry about the mess, i'm completly new to calculus, have no one around me to check my answers until monday and, I just want to know my mistakes. Again, thanks very much.