Multiplying a trinomial times a trinomial

Multiplying a trinomial times a trinomial

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  • hello! are you excited to learn how to multiply a trinomial by a trinomial!
  • hello!
  • yes! let's get started.
  • how do you think you are going to solve (3x2+2x+5)(2x3+5x2+3)
  • because you can't combine unlike terms!
  • well wouldn't the answer be 2x3+15x2+15  
  • no! the answer would be 6x5+10x3+15 because when multiplying you can combine unlike terms!
  • oh wow! I didn't know that.
  • now i'm going to give you a problem! (6x2+2x+7)(2x2+x+3)
  • easy! 12x2+2x+21!
  • nope! you have to add your exponents when multiplying so your answer would be 12x4+4x3+21
  • wow, thank you for correcting me!
  • well that's it for today! see you tomorrow!
  • bye!
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