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Maths Question Help

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Comments

  • #32
    MJ434
    Registered Users, Registered Users 2 Posts: 334 ✭✭MJ434


    Hi,
    Thanks a mill for that...

    U wouldn't be able to help me with this one would u? :P

    Solve the equation:

    1/x-1 + 4/x = 3

    Thanks!


  • #33
    Sir Ophiuchus
    Registered Users, Registered Users 2 Posts: 1,035 ✭✭✭Sir Ophiuchus


    Multiply all the elements in that equation by all the bottom lines. They should cancel out so everything ends up "above the line" and you have no fractions. Then you'll just have a regular equation in x, which you can shuffle around to solve for x.


  • #34
    II 2FAST2C II
    Site Banned Posts: 104 ✭✭II 2FAST2C II


    Sir Ophiuchus wrote: »
    Multiply all the elements in that equation by all the bottom lines. They should cancel out so everything ends up "above the line" and you have no fractions. Then you'll just have a regular equation in x, which you can shuffle around to solve for x.

    do you multiply everything by 3 also


  • #35
    TheBody
    Registered Users, Registered Users 2 Posts: 5,644 ✭✭✭TheBody


    II 2FAST2C II wrote: »
    do you multiply everything by 3 also

    No need to. Just multiply everything by x(x-1)


  • #36
    Sir Ophiuchus
    Registered Users, Registered Users 2 Posts: 1,035 ✭✭✭Sir Ophiuchus


    TheBody wrote: »
    No need to. Just multiply everything by x(x-1)

    What they said.

    Hint: 3 isn't on the bottom line. 3 is the same as 3/1.


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  • #37
    MJ434
    Registered Users, Registered Users 2 Posts: 334 ✭✭MJ434


    Can some do this one:
    Simplify (2x-z)(6x+3z)-(6a-3z)(2a+z) and factorise full the simplified expression.
    Thanks


  • #38
    MJ434
    Registered Users, Registered Users 2 Posts: 334 ✭✭MJ434


    TheBody wrote: »

    Can some do this one: Simplify (2x-z)(6x+3z)-(6a-3z)(2a+z) and factorise full the simplified expression. Thanks


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