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anonymous

  • one year ago

In which direction does the parabola open? y = –3x2 + 5x + 10 a. down b. up c. left d. right

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  1. anonymous
    • one year ago
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    @pooja195

  2. Michele_Laino
    • one year ago
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    hint: if we have the subsequent equation: \[\Large y = A{x^2} + Bx + C\] then we have the subsequent two cases: |dw:1432919493186:dw| or: |dw:1432919521156:dw|

  3. Michele_Laino
    • one year ago
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    first case when A >0 second case when A <0

  4. Michele_Laino
    • one year ago
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    A is the corfficient of x^2

  5. Michele_Laino
    • one year ago
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    what is the coefficient A, of your equation?

  6. anonymous
    • one year ago
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    coefficient?

  7. Michele_Laino
    • one year ago
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    A is the number which multiplies x^2

  8. anonymous
    • one year ago
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    3?

  9. Michele_Laino
    • one year ago
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    for example, if we have \[\Large y = - 7{x^2} + 2x + 5\] then A =-7

  10. anonymous
    • one year ago
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    okay, but what is a coefficient?

  11. Michele_Laino
    • one year ago
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    it is not 3, since in front of 3 there is a minus sign

  12. anonymous
    • one year ago
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    I don't understand what a coeffiecient IS

  13. Michele_Laino
    • one year ago
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    it is -3

  14. Michele_Laino
    • one year ago
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    namely: A=-3

  15. Michele_Laino
    • one year ago
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    so what is your case, the first or the second one?

  16. anonymous
    • one year ago
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    so it opens down? because A is less than 0?

  17. Michele_Laino
    • one year ago
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    that's right!

  18. anonymous
    • one year ago
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    thank you!! I understand now!

  19. amistre64
    • one year ago
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    a coefficient is simply the signed number of a term in the polynomial. \[P(x)=c_0+c_1x+c_2x^2+c_3x^3...\] the set of all the c's define the c.oefficients of the polynomial

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