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  1. A

    discriminant signs

    No, I mean, these signs, ≥ or ≤, when do we use them?
  2. A

    discriminant signs

    Yeah I get that. But what I don't get is when should we put the ">/< or equal to" sign?
  3. A

    discriminant signs

    I understand b^2-4ac = 0 for equal roots and <0 for no roots. But I get confused when < or equal and > or equal comes out. Does anyone have a list of the discriminant signs?
  4. A

    When is a function NOT differentiable?

    so if it is a straight line it cannot be differentiated? Can you explain with diagrams?
  5. A

    When is a function NOT differentiable?

    what do you mean continuous?
  7. A

    When is a function NOT differentiable?

    Like the question says, when is a function NOT differentiable?
  8. A

    Is this right?

    Wow, never thought of that before, thanks!
  9. A

    Is this right?

    So I got a question that says find the point of intersection between y=cosx and y=sinx. So sinx=cosx. How do I go from here?
  10. A

    Is this right?

    Nope, the question is sinx(3x+1). Also, how do you simplify sinx=cosx? Does it become sinx/cosx = 1?
  11. A

    Is this right?

    But for some reason, the answer is: 3cos(3x+1)
  13. A

    Is this right?

    It's the former
  14. A

    Is this right?

    Differentiate sinx(3x+1). u=sin x du=cos x v=3x+1 dv=3 Therefore, dy=3sinx + 3xcosx + cosx
  15. A

    Integration problem. Please help

    Oh, when I say square root x, I mean square root (x+1). Sorry for the trouble. May I ask you to do it again? Sorry.
  16. A

    Integration problem. Please help

    Can you show me how please?
  17. A

    Integration problem. Please help

    The shaded region in the diagram is bounded by the curve y=square root x+1, the y-axis and the line y=2. Find the volume of the solid formed when the shaded region is rotated about the x-axis.
  19. A

    trigonometric range question

    Determine the values of x for which 2sin3x > or equal to 1.
  20. A

    Stupid question, but anyway..

    10^2x - 5(10^x) + 4 = 0 I substituted x for u, and got u=1 and 4. My question is, 10^x=1, so x=0. But 10^x=4, what is x for this?
  21. A

    simplify this

    how do you know you have to multiply it by x?
  22. A

    simplify this

    Can you actually multiply stuff like that?
  23. A

    simplify this

    Yeah, that's the question
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