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daijagattison

Factor this trinomial. x2 + 3x - 4

  • one year ago
  • one year ago

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  1. math456
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    \[x ^{2}+4x-x+4\]

    • one year ago
  2. pratu043
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    = (x + 4)(x - 1)

    • one year ago
  3. OCWNotreDame
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    Think of what 2 numbers multiply to (-4) and add to (+3)

    • one year ago
  4. pratu043
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    That's right.

    • one year ago
  5. math456
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    \[x(x+4)-1(x+4)\] \[(x+4)(x-1)\]

    • one year ago
  6. apoorvk
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    4 has factors 1,2,2. now 1 - 2*2 can be written as '-3' so split the middle term '-3x' as 'x - 4x' --- then take common and proceed.

    • one year ago
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