2x2 -3x - 4 = 0
use the qudratic equation and your answers are 1.137458609 and -2.637458609
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If you mean b^2 -4ac then it is the discriminant of a quadratic equation. If the discriminant equals 0 then the equation has 2 equal roots. If the discriminant is greater than 0 then the equation has 2 different roots. If the discriminant is less than 0 then it has no real roots.
x2 + 3x - 18 = 0 (x - 3)(x + 6) = 0 x = 3 or -6
A linear equation.
x2-14x+45=0(x-9)(x-5)=0x-9=0 & x-5=0x=9 & x=5
Using the discriminant the possible values of k are -9 or 9