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Math Help - Algebra help

  1. #1
    hair pulling mum
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    Algebra help

    i have two algebra questions that my daughter needs to answer
    Expand 5(n-1)

    and
    factorise 5x - 15

    could some one please explain to me how to do this .. so i can help her with her homework

    thnks
    Tania
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by hair pulling mum View Post
    i have two algebra questions that my daughter needs to answer
    Expand 5(n-1)
    when we want to expand brackets, we take each thing just outside the bracket and multiply each thing on the inside. so here we have a 5 on the outside, so we take it and multiply the n on the inside and then the -1 on the inside and just add the answers.

    so, 5(n - 1) = 5*n + 5*(-1) = 5n - 5

    factorise 5x - 15
    here we want to do the opposite. we want to look for what is common among the terms and pull it out. here we see that 5 is common. since we can get 5 out of 5x to leave x, since 5x = 5*x and 5 out of 15 to leave 3, since 15 = 3*5

    so, 5x - 15 = 5x - 5(3) = 5(x - 3)

    do you get it?
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