Matematika

Pertanyaan

the difference between the tenth term and the seventh term of an arithmetic sequence is -60.the twelfth term divided by the sixth term is 2.find the first term and the common difference.
the difference between the tenth term and the seventh term of an arithmetic sequence is -60.the twelfth term divided by the sixth term is 2.find the first term

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  • U10-U7= -60
    a= first term , d= common difference
    a+9d - (a+6d) = -60
    a+9d -a -6d =-60
    3d= -60
    d= -20

    U12/U6 = 2
    U12=2U6
    a+11d=2(a+5d)
    a+11d=2a+10d
    d=a=-20

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