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    albear's Avatar
    albear Posts: 1,594, Reputation: 222
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    #1

    Jun 16, 2007, 09:43 AM
    solomon c4 paperA
    qn 3d

    r=(I+7j-5k)+(lambda)(3i-j-2k)

    find the ratio AC:CB

    co-ords of A -5,9,-9 B 25,-1,11 C 4,6,-3

    I thought I could do (-5+9-9)*(4+6-3):(4+6-3)*(25-1+11) and workout the ratio that way I get 1:7
    but mark scheme gets 3:7 how and why


    5a, for the last part of the table when x=2 I always get y=0.766 y=4(x^0.5)e^-x

    mark scheme gets 1.083


    qn 6)find the integral of 2sin3x sin2x dx I tried parts but went wrong some where





    Andrew Cropley
    albear's Avatar
    albear Posts: 1,594, Reputation: 222
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    #2

    Jun 16, 2007, 10:13 AM
    Help with any would be appreciated
    albear's Avatar
    albear Posts: 1,594, Reputation: 222
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    #3

    Jun 16, 2007, 10:36 AM
    OK you don't have to help with 6 now igot that one sorted
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Jun 16, 2007, 03:20 PM
    qn 3d

    ?? What does this have to do with anything? Lagrange multipliers?

    find the ratio AC:CB

    co-ords of A -5,9,-9 B 25,-1,11 C 4,6,-3

    i thought i could do (-5+9-9)*(4+6-3):(4+6-3)*(25-1+11) and workout the ratio that way i get 1:7
    but mark scheme gets 3:7 how and why







    5a, for the last part of the table What table? when x=2 i always get y=0.766 y=4(x^0.5)e^-x

    mark scheme gets 1.083
    I don't know what this is, but if you enter x=2 into y, you get y=0.766. Perhaps you have the wrong formula?

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