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aussy123

  • 3 years ago

Can someone explain this to me? I already know the answer, but I don't understand why its the answer. Without solving the equation, determine the nature of the roots of x2 - 2x - 8 = 0. Two, real unequal roots Two, real equal roots No real roots

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  1. UnkleRhaukus
    • 3 years ago
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    \[ax^2+bx+c=0\]consider the discriminant \[\Delta=b^2-4ac\]

  2. UnkleRhaukus
    • 3 years ago
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    the discriminant is part of the quadratic formula \[x=\frac{-b\pm\sqrt{\Delta}}{2a}\]

  3. UnkleRhaukus
    • 3 years ago
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    the quadratic formula takes plus and minus the square root of the discriminant, plus and minus a square root will have one value if the term in the square root is 0, two values if the term in the sqrt is positive, and no real values f the term in the square is negative

  4. UnkleRhaukus
    • 3 years ago
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    *if

  5. aussy123
    • 3 years ago
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    Okay thanks, this is a mouthful but I understand lol.

  6. UnkleRhaukus
    • 3 years ago
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    **and no real values if the term in the square root is negative

  7. UnkleRhaukus
    • 3 years ago
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    yeah it is a complicate formula

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