# Recent content by wisredz

1. ### Self-Taught Calculus

well I'm 17 and started to learn it when I was 16 :) I'm a self-taught too. If you work hard why not man? everything is possible.
2. ### Can't get this

yeah I know it, I said I did it that way. But the problem is that nothing is told about it. Anyway thnaks, I think the question wasn't complete in this case
3. ### Can't get this

that's because of this. suppose that a=x+y and b=xy then \sqrt (a + 2\sqrt b) = \sqrt x+ \sqrt y Ivy, I don't get what you mean. How do you know if the numbers x and y are rational then the only solution is x=y=0.5? and how do you know there is an infinite number of solutions if they...
4. ### Can't get this

How does he implies that? I got there before but I supposed that x and y are not irrational
5. ### Can't get this

can't get this!!! Hi there, I have a question that I cannot solve. Here it is. \frac{1}{\sqrt(4-2\sqrt3)}=x+y\sqrt3 then what is x^2+y^2? All I did was finding what left hand side stood for. It equals \frac{\sqrt3 + 1}{2} Any help?
6. ### Finding an antiderivative using substitution rule

replace 2x by u and you have secu 's derivative under the integral sign
7. ### Need help deriving a formula

Try to draw the velocity-time graph. The area under the curve will give you the displacement.
8. ### Values of a and b

oh yes thank you everybody. I must be getting dumber by each second to miss this...
9. ### Values of a and b

Yes but isn't there an algeabric way to calculate those values?
10. ### Values of a and b

Well thanks but I just introduced myself to the integral calculus so I do not understand anything from what you say. edit: btw graphing doesn't count it is too easy using the graph
11. ### Values of a and b

\int_a^b (x-x^2)dx What values of a and b make this integral's value maximum? I have tried to do it but cannot get it. I know that the maximum value of x-x^2 is 0,25. but I'm stuck from there. I try to write the integral in the form of a riemann sum but (b-a)s cancel each other.what am I to...