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Math Help - i need help on simplifying these and then classifying result by number of terms

  1. #1
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    i need help on simplifying these and then classifying result by number of terms

    (2c^2+9)-(3c^2-7)
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  2. #2
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    Quote Originally Posted by racerfreak05 View Post
    (2c^2+9)-(3c^2-7)
     (2c^2+9)-(3c^2-7)

    Multiply through the 2nd bracketed term by the negative!

     (2c^2+9)-3c^2-(-7)

     2c^2+9-3c^2+7

    Collect like terms:

     -c^2+16

    Change the order so the positive term is first!

     16-c^2

    Recognise that this is a difference of two squares since  16 = 4^2 :

     4^2-c^2

     (4-c)(4+c)
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