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Math Help - Some of my math lab problems?

  1. #1
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    Some of my math lab problems?

    1, 7(x-x2 ) +4(x2-2x)

    2, 3+2x- 2/5(10x -3)

    3, -2(x2 +7x-5)

    4, 2/3(x-1/3) - (x+2)

    5, 2x-12 for x =-3

    6, x/2+3x for X=-2

    7, x/2 + 3x for x=2/5

    8, 2z2-z+1 for z=-1/2

    9, z-z2 for z=-2/3

    10, -x3 + 7x for x=1/5

    Thank you to anyone who is willing to help me with these
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  2. #2
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    Quote Originally Posted by Kevin19 View Post
    1, 7(x-x2 ) +4(x2-2x)
    In this type of question you have to expand the brackets, The number outside is multiplied through each term inside.

    7(x-x^2 ) +4(x^2-2x)

    7\times x-7\times x^2 +4\times x^2-4\times 2x

    7x-7x^2 +4x^2-8x

    Now you must group any like terms.

    -3x^2 -x

    This will help you with questions 1-4


    Quote Originally Posted by Kevin19 View Post

    5, 2x-12 for x =-3
    This time replace x with -3

    2x-12

    2(-3)-12

    -6-12

    -18

    This will help you with questions 5 onwards.
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