Cerul-Ean said:
i would like to know how many people acutallyuse this more thank twice a YEAR or is it just useless! ITS SO DARN HARD.... personally i think that quadratic equations are EVIL!!! :twisted:
First of all, Ax + Bx + C = 0 is NOT the equation;
the equation is: Ax^2 + Bx + C = 0
The quadratic FORMULA is used to solve for x (A, B and C are givens).
That formula is: x = [-B +or- sqrt(B^2 - 4AC)] / [2A].
It is VERY USEFUL when factoring is difficult;
easy: x^2 - 5x + 6 = 0 : (x - 2)(x - 3) = 0 : x = 2 or x = 3
(so no need to use the FORMULA)
difficult: 6x^2 + 5x - 21 = 0
can you factor that? NO; so use the FORMULA:
x = [-5 +or- sqrt(5^2 - 4(6)(-21))] / [2(6)]
What's so HARD about that?
