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Math Help - Please help me with these exercises!

  1. #1
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    Please help me with these exercises!

    | 3x^2+5x-4 | = 2x-1

    and this one

    | 7x +5 | - 2x >= 11
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  2. #2
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    Quote Originally Posted by loliki View Post
    | 3x^2+5x-4 | = 2x-1

    and this one

    | 7x +5 | - 2x >= 11
    Hi

    For the first one

    There will be 2 cases :

    3x^2+5x-4=2x-1 OR -3x^2-5x+4=2x-1

    For the second one

    There will also be 2 cases

    7x+5-2x\geq11 OR -7x-5-2x\geq11
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  3. #3
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    Thx dude, but.. i know about the 2 cases, i don't know what should i do after the cases, how can i solve the inequalities ?
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  4. #4
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    Quote Originally Posted by loliki View Post
    Thx dude, but.. i know about the 2 cases, i don't know what should i do after the cases, how can i solve the inequalities ?
    7x + 5 \ge 2x + 11

    5x \ge 6

    x \ge \frac{6}{5}


    -(7x + 5) \ge 2x+11

    -7x-5 \ge 2x+11

    -9x \ge 16

    x \le -\frac{16}{9}
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  5. #5
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    Thank you a lot!!!
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