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Diana0920

  • 2 years ago

how can I factor 2x^2-X-10?

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  1. dumbcow
    • 2 years ago
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    multiply first/last --> 2*-10 = -20 find 2 factors of -20 that add up to "middle coefficient" -1

  2. Diana0920
    • 2 years ago
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    4 and -5

  3. dumbcow
    • 2 years ago
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    correct now split up the "-x" into "4x -5x" then factor by grouping

  4. Diana0920
    • 2 years ago
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    that's what I don't quite understand

  5. dumbcow
    • 2 years ago
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    ok once you get factors rewrite it 2x^2 +4x -5x -10 split into 2 groups (2x^2 +4x)+(-5x-10) factor each group 2x(x +2)-5(x+2) pull out common factor of "x+2" (x+2)(2x-5) done

  6. Diana0920
    • 2 years ago
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    that easy?! Thanks! (:

  7. dumbcow
    • 2 years ago
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    thats it....use same steps for any quadratic factoring prablem

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