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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
 one year ago
 one year 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
 one year ago
 one year ago

This Question is Closed

UnkleRhaukusBest ResponseYou've already chosen the best response.1
\[ax^2+bx+c=0\]consider the discriminant \[\Delta=b^24ac\]
 one year ago

UnkleRhaukusBest ResponseYou've already chosen the best response.1
the discriminant is part of the quadratic formula \[x=\frac{b\pm\sqrt{\Delta}}{2a}\]
 one year ago

UnkleRhaukusBest ResponseYou've already chosen the best response.1
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
 one year ago

aussy123Best ResponseYou've already chosen the best response.0
Okay thanks, this is a mouthful but I understand lol.
 one year ago

UnkleRhaukusBest ResponseYou've already chosen the best response.1
**and no real values if the term in the square root is negative
 one year ago

UnkleRhaukusBest ResponseYou've already chosen the best response.1
yeah it is a complicate formula
 one year ago
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