supercool123
supercool123 supercool123
  • 26-11-2015
  • Mathematics
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Express as a trinomial: (2x – 3)(x+4)

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TSO
TSO TSO
  • 26-11-2015
[tex](2x - 3)(x+4) = (2x)(x) + (2x)(4) - (3)(x) - (3)(4)\\\\=2x^2 + 8x - 3x - 12\\\\ = \boxed{\bf{2x^2+5x - 12}}[/tex]

We used the FOIL method, which is basically:
[tex](a+b)(c+d) = ac + ad + bc + bd[/tex]
Just becareful about the signs in the parenthesis. :)
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