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daijagattison

  • 3 years ago

Factor this trinomial. x2 + 3x - 4

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  1. math456
    • 3 years ago
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    \[x ^{2}+4x-x+4\]

  2. pratu043
    • 3 years ago
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    = (x + 4)(x - 1)

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

  4. pratu043
    • 3 years ago
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    That's right.

  5. math456
    • 3 years ago
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    \[x(x+4)-1(x+4)\] \[(x+4)(x-1)\]

  6. apoorvk
    • 3 years ago
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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.

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