Use the discriminant to determine which of these equations has no solution.

A. x^2-x-3 = 0
B. x^2 + 10x + 25 = 0
C. x^2 + x + 1
D. x^2 -1 = 0

Question

Use the discriminant to determine which of these equations has no solution. 

A. x^2-x-3 = 0
B. x^2 + 10x + 25 = 0
C. x^2 + x + 1
D. x^2 -1 = 0

inkyvoyd · Answer

The discriminant D in the equation
$ax^2+bx+c=0$
is
$\Huge D=b^2-4ac$

parthkohli · Answer

One of them isn't even an equation. Now can you see it or you've written the question wrong?

anonymous · Answer

discriminant is :
$$D=b ^{2}-4ac$$
if this value is negative, means no solution

anonymous · Answer

wrote it wrong. C should be x^2 + x + 1 = 0

anonymous · Answer

i know how to do the discriminant....but I got two negatives

C. and D. 

I got this: 

A. 13 
B. 0 
C. -3 
D. -4 

so what did I do?

anonymous · Answer

A.  1-4(-3)=13, correct
B. 0, correct
C.correct
D. 0-4(-1)=4

so c is the only one with no real solutions

anonymous · Answer

wow, thanks!