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anonymous

  • one year ago

Decide which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring. −b b2 − 4ac 2a Use the part of the quadratic formula that you chose above and find its value, given the following quadratic equation: 2x2 + 7x + 3 = 0

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  1. anonymous
    • one year ago
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    @ali2x2

  2. ali2x2
    • one year ago
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    Let D = b^2 − 4ac This is known as the discriminant

  3. ali2x2
    • one year ago
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    If the discriminant D is a perfect square, then ax^2 + bx + c can be factored

  4. ali2x2
    • one year ago
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    Compare 2x^2 + 7x + 3 to ax^2 + bx + c

  5. ali2x2
    • one year ago
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    what are the values of 'a', 'b' and 'c'?

  6. ali2x2
    • one year ago
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    a = 2, b = 7 and c = 3

  7. ali2x2
    • one year ago
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    So D = b^2 - 4ac D = 7^2 - 4(2)(3) ... Plug in a = 2, b = 7 and c = 3 D = 49 - 24 D = 25

  8. ali2x2
    • one year ago
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    is 25 a perfect square?

  9. ali2x2
    • one year ago
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    yes or no?

  10. anonymous
    • one year ago
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    yes

  11. ali2x2
    • one year ago
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    so 2x^2 + 7x + 3 can be factored

  12. ali2x2
    • one year ago
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    then the ending value is 25

  13. ali2x2
    • one year ago
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    they just want the value of b^2 - 4ac

  14. ali2x2
    • one year ago
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    you type in 25

  15. ali2x2
    • one year ago
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    that's the final value of b^2 - 4ac

  16. ali2x2
    • one year ago
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    where a = 2, b = 7 and c = 3

  17. anonymous
    • one year ago
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    is 25 the final answerr

  18. ali2x2
    • one year ago
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    yes thats the final value of b^2 - 4ac where a = 2, b = 7 and c = 3

  19. ali2x2
    • one year ago
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    final value : final value of b^2 - 4ac = 25 where :a = 2, b = 7 and c = 3

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