a) an imaganiry #
b) 0
c) a positive #
d) a negative #
2007-01-07 08:43:58 · 4 answers · asked by Girlfromnowhere 2 in Science & Mathematics ➔ Mathematics
the discriminant is the value under the radical sign in the quadratic formula, ie b^2-4ac.
the only way to get two roots is if the discriminant is positive.
if disc. is zero, there is one root
if disc. is negative, there are imaginary roots
2007-01-07 08:53:01 · answer #1 · answered by davidosterberg1 6 · 0⤊ 0⤋
The discrimant is 36 and its +ve bcuz its b^2 - 4ac = (-2)^2 - 4(1)(-8) = 4 + 32 = 36..and u look very good on ur avatar :D
2007-01-07 08:58:08 · answer #2 · answered by avant1991 3 · 0⤊ 0⤋
ax^2 + bx + c = 0
If 2 roots are - 2 and 4,
a = 1, b = - (-2+4) = - 2, c = (-2)(4) = - 8
Discriminant = b^2 - 4ac = (-2)^2 - 4(1)(-8) = 4 + 32 = 36
2007-01-07 08:51:31 · answer #3 · answered by Sheen 4 · 0⤊ 0⤋
the discriminant is 36, which is positive. fyi if there are two roots to a quadratic equation the discriminant has to be positive
2007-01-07 08:48:09 · answer #4 · answered by Laura 2 · 0⤊ 0⤋