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Math Help - difference of squares

  1. #1
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    difference of squares

    factorise using difference of squares

    (a) x^2 -25

    do i use a^2-2ab+ b^2

    (b) 9 p^2-4  <br />
q^2<br />

    do i use
    and a^2 -b^2
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  2. #2
    MHF Contributor alexmahone's Avatar
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    Quote Originally Posted by decoy808 View Post
    factorise using difference of squares

    (a) x^2 -25

    do i use a^2-2ab+ b^2

    (b) 9 p^2-4  <br />
q^2<br />

    do i use
    and a^2 -b^2
    a^2-b^2=(a+b)(a-b)

    a) x^2-25=x^2-5^2=(x+5)(x-5)

    b) 9p^2-4q^2=(3p)^2-(2q)^2=(3p+2q)(3p-2q)
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