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InspectorJoe

  • one year ago

what times # = -20 but when added =- 7?

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  1. Nnesha
    • one year ago
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    what are the factors of 20 ?

  2. inspectorjoe
    • one year ago
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    factors of -20.. I know -5X4 but when I add it does not =-7

  3. Nnesha
    • one year ago
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    yes right and when u multiply -2 times -5 you will get 20 but not -20 so `none` are solving quadratic equation ?

  4. inspectorjoe
    • one year ago
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    no. here is my problem 3y^2+7y-20= factors

  5. Nnesha
    • one year ago
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    i knew it! leading coefficient isn't one so u should multiply AC

  6. Nnesha
    • one year ago
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    so first multiply 3 times -20 then find two numbers

  7. inspectorjoe
    • one year ago
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    oh great yes I got thanks

  8. anonymous
    • one year ago
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    |dw:1441759651765:dw|

  9. anonymous
    • one year ago
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    congrats

  10. Nnesha
    • one year ago
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    remeber for AC method find two numbers when you multiply them you should get product of AC(a=leading coefficient , c=constant)

  11. inspectorjoe
    • one year ago
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    i came up with -17

  12. Nnesha
    • one year ago
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    and do you know you can't write the answer like (x+1st number) (x+2nd number)

  13. Nnesha
    • one year ago
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    what do you mean `-17`?

  14. inspectorjoe
    • one year ago
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    I took 3 X -20 to come up with my needed number

  15. Nnesha
    • one year ago
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    oh no i meant first multiply 3 times -20= which is equal to -60 now find two numbers when you multiply them you should get -60 but when you add or subtract them you should get -7

  16. Nnesha
    • one year ago
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    +7**

  17. inspectorjoe
    • one year ago
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    :O(?

  18. Nnesha
    • one year ago
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    ??

  19. Nnesha
    • one year ago
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    if leading coefficient is one then we still have to multiply A times C but as u know when you multiply by one you will get the same thing but here leading coefficinet is 3 so multiply a times c = 3 times -20 then find two numbers

  20. inspectorjoe
    • one year ago
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    right great thanks

  21. Nnesha
    • one year ago
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    np :=)

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