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anonymous

  • 5 years ago

x² + 4x - 7 = 0 Solve, show work.

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  1. anonymous
    • 5 years ago
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    you have to use the quadratical general formula.

  2. anonymous
    • 5 years ago
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    can you show me how?

  3. anonymous
    • 5 years ago
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    Ok general formula for quadratic equations is the following: \[x=(b^{2}\pm \sqrt{b^{2}}-4ac)/2a\] The big mistery here is what a, b and c means, right? If you look the coefficient of x^2, you can see it is 1. The same for the coefficient of x that is equal to 4. You can realize that c is equal to -7. Now replace in the formula above each value and you will find the answer (values for x)

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spraguer (Moderator)
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