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anonymous

  • 4 years ago

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
    • 4 years ago
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    The discriminant. b^2-4ac must be >0 for real number factors.

  2. anonymous
    • 4 years ago
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    It's [b ^{2}-4ac\] But I don't remember why or how. To solve it it's easy, think of your equation in this way: a is paired with x because x is earlier in the alphabet, so is a b is paired with y because y is after x in the alphabet, as is b to a and c is always your number on it's own.

  3. anonymous
    • 4 years ago
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    no idea how to do this its a pretest i just need a numerical answer to the second part

  4. anonymous
    • 4 years ago
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    Don't you have the quadratic formula?

  5. anonymous
    • 4 years ago
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    You can also do it by grouping

  6. anonymous
    • 4 years ago
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    You just have to plug the numbers from the equation they gave you into the answer you chose for the first part and solve it.

  7. anonymous
    • 4 years ago
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    Actualy, grouping is not going to work here. Use the quadratic formula

  8. anonymous
    • 4 years ago
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    if i seen it i would understand

  9. anonymous
    • 4 years ago
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    The whole quadratic formula isn't needed, just the part of the equation picked in part 1. Take the b^2 - 4ac and put in the values of b, a, and c and compute it using a calculator.

  10. anonymous
    • 4 years ago
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    Oh yes, only the discriminant is needed. Skimmed that part.

  11. phi
    • 4 years ago
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    The second part of the question is asking you to find b^2 - 4ac So you need to find a,b, and c, and use the above formula the a, b, and c come from a x^2 + bx + c so match your quadratic 2x^2 + 7x + 3 = 0 to find a,b, and c.

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