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31 January, 11:15

Find all real numbers x such that |7x - 4| = 38

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  1. 31 January, 13:08
    0
    Hello,

    if 7x-4>=0 (or x>=4/7) then

    |7x-4|=7x-4

    7x-4=38

    ==>7x=42

    ==>x=6

    if 7x-4<0 (or x<4/7) then

    |7x-4|=-7x+4

    -7x+4=38

    ==>-7x=34

    ==>x=-34/7

    sol={6; - 34/7}
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