anonymous
  • anonymous
Which of the following expressions is equal to (x+2)+(x-2)(2x+1)? A.2x^2-2x B.2x^2-4x C.2x^2+x D.4x^2+2x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
Easiest way to check: Plug in x=1 for x in the first equation, then do the same for the other four. If you get the same answer then that's it.
anonymous
  • anonymous
ya i plugged in x=1 and i got 3 for all of them but what would be the answer....?
anonymous
  • anonymous
Or choose another number, something obscure, like 12. But you can also find it by expanding out and combining like terms. (x+2) + (x-2)(2x+1) = (x+2) + (2x^2 + x -4x -2) = 2x^2 -2x A.

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anonymous
  • anonymous
ok thankx!!!

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