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CALCULATE GRADIENT OF CURVE

  • 26-10-2008 11:50am
    #1
    B1977
    Registered Users, Registered Users 2 Posts: 410 ✭✭


    without drawing graph calculate gradient of the curve y=3xsquared+2x+7=0
    at the point where x= -2

    can you use y=mx+c:confused:


Comments

  • #2
    JSK 252
    Registered Users, Registered Users 2 Posts: 1,257 ✭✭✭JSK 252


    Just dy/dx the curve and fill it in for x= -2


  • #3
    Piste
    Registered Users, Registered Users 2 Posts: 11,440 ✭✭✭✭Piste


    Does gradient mean slope?




    /me fails maths


  • #4
    [Deleted User]
    Posts: 4,630 ✭✭✭ [Deleted User]


    Yah, just differentiate the equation of the curve, fill in -2 for x and there ya go, thats the slope at that point. (At least I think that's what you've to do anyway, I'm probably wrong).


  • #5
    insinkerator
    Registered Users, Registered Users 2 Posts: 1,165 ✭✭✭insinkerator


    y=3x^2 + 2x +7

    differentiating an equation finds the slope of it.

    dy= 6x +2
    dx

    let x= -2

    slope of curve at x= -2

    6(-2) + 2

    -10


  • #6
    timmywex
    Registered Users, Registered Users 2 Posts: 2,626 ✭✭✭timmywex


    Tricky question, not hard, just saying gradient instead of slope made it tricky!


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