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Math Help - Find age of son, have values for granny and mammy

  1. #1
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    Find age of son, have values for granny and mammy

    mothers age is 10 times her sons(ken),
    kens granny is ^2 of his age
    the granny is 24 years older than kens mammy find kens age
    ken=x granny=x^2 mammy=x^2-24

    so find age of ken

    X x 10=X^2 - 24
    24 + 10=X^2-X^2
    X^2 - 10X -24=0

    could someone tell me if this is correct please...
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  2. #2
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    Hello, wolfhound!

    You're doing great . . . Nice work!

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  3. #3
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    Quote Originally Posted by Soroban View Post
    Hello, wolfhound!

    You're doing great . . . Nice work!

    Hi,Thanks for your reply,
    But how would I finish it??

    x^2-10x-24=0
    x^2-12x +2x-24=0
    x(x-12)+2(x-12)=0
    (x+2)(x-12)
    x=-2 x=12
    12-2=10 so kens age is 10??
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  4. #4
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    Quote Originally Posted by wolfhound View Post
    Hi,Thanks for your reply,
    But how would I finish it??

    x^2-10x-24=0
    x^2-12x +2x-24=0
    x(x-12)+2(x-12)=0
    (x+2)(x-12)
    x=-2 x=12
    12-2=10 so kens age is 10??

    HI

    you are correct to find that x=-2 or x=12

    so Ken's age will be one of them . Since age cant be negative , can it ??

    so ken would be 12 years old .
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  5. #5
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    Quote Originally Posted by mathaddict View Post
    HI

    you are correct to find that x=-2 or x=12

    so Ken's age will be one of them . Since age cant be negative , can it ??

    so ken would be 12 years old .
    Thanks
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