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thatgirl666

The product of (a + b)(a − b) is a perfect square trinomial.

  • one year ago
  • one year ago

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  1. thatgirl666
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    Sometimes Always Never

    • one year ago
  2. ZeHanz
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    If you FOIL it: First: a*a = a² Outer: a*(-b) = -ab Inner: b*a = ab Last: b*(-b) = -b² Add up everything: a² + -ab + ab + b². What do you think about the middle two terms?

    • one year ago
  3. thatgirl666
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    theyre the same?

    • one year ago
  4. timo86m
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    it expands to a^2-b^2 so it never a trinomial

    • one year ago
  5. thatgirl666
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    So its never?

    • one year ago
  6. timo86m
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    never cuzz the middle terms cancel out meaning you always get a binomial, not a trinomial

    • one year ago
  7. thatgirl666
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    ohhhh okay :) thank you!

    • one year ago
  8. ZeHanz
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    The middle two terms cancel: -ab+ab=0, so you are left with only a²-b². So never a trinomial; there are only two terms.

    • one year ago
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