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cuppycake

Choose the correct product of (5x + 4)2. 25x2 + 40x + 16 25x2 − 16 25x2 + 16 25x2 − 40x + 16

  • 2 years ago
  • 2 years ago

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  1. brinethery
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    (5x+4)(5x+4) Do you know how to use the FOIL method?

    • 2 years ago
  2. cuppycake
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    no

    • 2 years ago
  3. brinethery
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    First, Outer, Inner, Last. Your first terms that you need to multiply are 5x and 5x 5x*5x = 25x^2 Your outer terms that you need to multiply are 5x and 4. 5x*4 = 20x Your inner terms that you need to multiply are 5x and 4. 5x*4 = 20x You last terms that you need to multiply are 4 and 4. 4*4 = 16 So you have 25x^2, 20x, 20x, and 16 that you need to "combine." 25x^2 +20x +20x +16 = 25x^2 +40x +16

    • 2 years ago
  4. cuppycake
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    ah wow thanks so much!

    • 2 years ago
  5. brinethery
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    Watch this :-) http://www.youtube.com/watch?v=Twtdsp0a1Iw

    • 2 years ago
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