Question 1124033: Find k so that (k + 1)x^2 + 5x + 2k - 1 = 0 has two real solutions.
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website! Find  so that has   solutions.
use discriminant:
if discriminant is negative, , our equation has two complex solutions
if discriminant is positive, , our equation has solutions which they are real
if discriminant is zero,  , our equation has one solution which is real
...here,  , , and 
use quadratic formula:
solutions:
so, we will have if and
check:
...if
solutions are:
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≈
graph:
...if
solutions:
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