Question

Discriminant of kx2 - x - 2 = 0 ls 25 then k = _____ ​

Answer 1

Answer:

$k \: = 3$

Step-by-step explanation:

For a quadratic equation,

$a {x}^{2} + bx + c = 0$

Dicriminant =

${b}^{2} - 4ac$

Here, discriminant = 25

${( - 1)}^{2} - 4k \times ( - 2) = 25$

$1 + 8k = 25$

$8k \: = 24$

$k \: = 3$

Answer 2

Answer:

Discriminant =b²-4ac

(-1)²-4×k×(-2)

1+8k