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    I thought i knew how to do this, but somewhere solution bank chaged a number and im not sure why:
    f(x)=x^3+ax+b
    when it's divided by (x-4) the remainder is 32
    when its divided by (X+2) the remainder is -10
    Find a and b
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    (Original post by vishnarliee)
    I thought i knew how to do this, but somewhere solution bank chaged a number and im not sure why:
    f(x)=x^3+ax+b
    when it's divided by (x-4) the remainder is 32
    when its divided by (X+2) the remainder is -10
    Find a and b
    What have you tried?
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    (Original post by SeanFM)
    What have you tried?
    I used the factor therom, and i solved simultaneously, for the first equation i got '4a+b=-32', which is right according to solution bank. for the second i got '-2a+b=-2', but according to solution bank it should be equal to 40?
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    (Original post by vishnarliee)
    I used the factor therom, and i solved simultaneously, for the first equation i got '4a+b=-32', which is right according to solution bank. for the second i got '-2a+b=-2', but according to solution bank it should be equal to 40?
    Okay, what did you do to get that second equation then?
 
 
 
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