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Math Help - Solving Quadratic and Linear Equations

  1. #1
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    Solving Quadratic and Linear Equations

    can you please answer these questions simply and simple workings out pleeeeaseee and tell me the answer!


    Answer show workings
    1) Solve 5(x+1)=3x + 12

    2)facotorise x(squared) + 5x + 4

    3) rearrange the forumla to make x the subject y = b- ax(squared)

    4) solve x(squared) + 5x + 4 = 0
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  2. #2
    Member TheMasterMind's Avatar
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    Quote Originally Posted by gilzean View Post
    can you please answer these questions simply and simple workings out pleeeeaseee and tell me the answer!


    Answer show workings
    1) Solve 5(x+1)=3x + 12

    2)facotorise x(squared) + 5x + 4

    3) rearrange the forumla to make x the subject y = b- ax(squared)

    4) solve x(squared) + 5x + 4 = 0
    I'll get you started on the first couple, make an attempt at the others

    1/

    5x+5=3x+12

    5x -3x=12-5

    2x=7

    <br />
x=7/2<br />

    x=3.5

    2/

    x^2+5x+4

    =(x+4)(x+1)

    Note: 4 is a continuation of 2
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  3. #3
    A riddle wrapped in an enigma
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    Quote Originally Posted by gilzean View Post
    can you please answer these questions simply and simple workings out pleeeeaseee and tell me the answer!


    3) rearrange the forumla to make x the subject y = b- ax(squared)
    y=b-ax^2

    -ax^2=y-b

    x^2=\frac{y-b}{-a}

    x=\pm \sqrt{\frac{y-b}{-a}}

    x=\pm \sqrt{\frac{b-y}{a}}
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