Question

9y = 13y2 - 4
The discriminant of the quadratic is ?

Answer 1

289

Explanation:

`13y^2-9y-4 = 0\\`

D =
`b^2-4ac`

Wherein,

b = 9

a = 13

c = -4

`D = 9^2-(4*13*-4)\\= 289`

Answer 2

289

Explanation:

1. if to re-write the given equation, then 13y²-9y-4=0;

2. if to calculate the required discriminant, then:

D=81+13*4*4=208+81=289.