anonymous
  • anonymous
how to simplify (x-3)-(x+1)(2x+5)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
this is just an expression ?
anonymous
  • anonymous
expand (x+1)(2x+5) using product rule of polynomials
anonymous
  • anonymous
x-3-2x^2-2x-5x-5 =-(2x^2+6x+8) =-2(x^2+3x+4)

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anonymous
  • anonymous
By F.O.I.L (First Outer Inner Last) we can expand: \[(x+1)(2x+5) = 2x^2+5x+2x+5=2x^2+7x+5\] Then we've got: \[(x-3)-(2x^2+7x+5)=(2x^2+6x+2)\] ...man, I am super rusty. I still for some reason think I've done something wrong!
anonymous
  • anonymous
yeah ur wrong..this is the correct answer... -2x^2+8x+2
anonymous
  • anonymous
Well now we've got three answers...lets try to come to agreement (not that I claim I am certainly correct...attempting again!
anonymous
  • anonymous
dat's 5n.

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