quadrati function question. (1 Viewer)

[astroman]

Find all values of K for which (K+2)x^2+x-3=0, has 2 real unequal roots.

i keep getting K<5/4 but answer is K>-2(1/12)

 

[braintic]

1^2 - 4(k+2)(-3) >0

1+12(k+2) > 0

12k+25 > 0

k > -25/12

 

[astroman]

thanks