anonymous
  • anonymous
x² + 4x - 7 = 0 Solve, show work.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
you have to use the quadratical general formula.
anonymous
  • anonymous
can you show me how?
anonymous
  • anonymous
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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