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anonymous

  • one year ago

What are the x-intercepts of the quadratic function? y = x2 + x – 2 A. –2 and 1 B. 2 and 1 C. 1 D. 2 and –1 @pooja195

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  1. anonymous
    • one year ago
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    @mathmate

  2. anonymous
    • one year ago
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    set y=0 and solve for x

  3. anonymous
    • one year ago
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    can you explain on the drawing tool?

  4. anonymous
    • one year ago
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    |dw:1433021112375:dw|

  5. anonymous
    • one year ago
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    So the x-intercept is where the function crosses the x-axis.

  6. anonymous
    • one year ago
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    The x-axis is located where y=0

  7. anonymous
    • one year ago
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    so set y=0 in the equation

  8. anonymous
    • one year ago
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    this gives 0 = x^2 + x -2

  9. anonymous
    • one year ago
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    okay!

  10. anonymous
    • one year ago
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    now solve for x

  11. anonymous
    • one year ago
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    im confused??

  12. anonymous
    • one year ago
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    i barley started learning this!?

  13. anonymous
    • one year ago
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    you have to factor the equation

  14. anonymous
    • one year ago
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    ???

  15. anonymous
    • one year ago
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    x^2 + x - 2

  16. anonymous
    • one year ago
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    oh ok

  17. anonymous
    • one year ago
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    what two numbers equal 1 when you add them together, and equal -2 when you multiply them together?

  18. anonymous
    • one year ago
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    -1?

  19. anonymous
    • one year ago
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    nope

  20. anonymous
    • one year ago
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    umm

  21. anonymous
    • one year ago
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    give me two number that multiply together to get -2

  22. anonymous
    • one year ago
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    1 times -2

  23. anonymous
    • one year ago
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    ok, now add those together. what do you get

  24. anonymous
    • one year ago
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    -3

  25. anonymous
    • one year ago
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    nope. 1-2

  26. anonymous
    • one year ago
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    -1

  27. anonymous
    • one year ago
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    that's right, but we need a number that adds to one

  28. anonymous
    • one year ago
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    what else multiplies together to get -2?

  29. anonymous
    • one year ago
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    -1 and 2?

  30. anonymous
    • one year ago
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    i am not sure? @1

  31. anonymous
    • one year ago
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    @10115658

  32. anonymous
    • one year ago
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    ok, now add them together

  33. anonymous
    • one year ago
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    -3?

  34. anonymous
    • one year ago
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    i mean 1

  35. anonymous
    • one year ago
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    that's right.

  36. anonymous
    • one year ago
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    so its D?

  37. anonymous
    • one year ago
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    so now we have our factored equation (x+2) (x-1)

  38. anonymous
    • one year ago
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    its -2 and 1

  39. anonymous
    • one year ago
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    its A then?

  40. anonymous
    • one year ago
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    correct, good job

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