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carl-l

carl-l

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carl-l
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  • It's called the quadratic formula, and you (should have) learned it a few years ago. If ax^2 + bx + c = 0, then x = [-b +/- sqrt(b^2 - 4ac)]/(2a). You're using y's instead of x's, and a=1, b=3, and c=7. So the b^2 becomes 9 and the -4ac becomes +…
  • It's called the quadratic formula, and you (should have) learned it a few years ago. If ax^2 + bx + c = 0, then x = [-b +/- sqrt(b^2 - 4ac)]/(2a). You're using y's instead of x's, and a=1, b=3, and c=7. So the b^2 becomes 9 and the -4ac becomes +…