# C1 Maths HelpWatch

Thread starter 4 years ago
#1
On my homework there are some questions I dont understand

What does the value of this discriminant (-4) tell you about the solutions of the equation x^2+4x + 5?

And what does show the coordinates of any points where the graph cuts the coordinate axis mean?
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4 years ago
#2
Have you learned about the discriminant?

If discriminant > 0, there are two real roots.
If discriminant < 0, there are no real roots.
If discriminant = 0, there is 1 root.

It means that when you do your sketch, you will need to make it clear where where your curve crosses the axes you draw. So if it crosses at (1,0), you would either write (1,0) next to this point, or indicate 1 on the x-axis.
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Thread starter 4 years ago
#3
I have learned about the discriminant. I just don't understand what the question is asking because of how it is worded. I forgot to put that =0 on the end the equation, the equation is x^2+4x + 5=0. So would the discriminant be =0 like in the equation or <0 as I worked the discriminant out to be -4?
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4 years ago
#4
(Original post by shoakuma)
I have learned about the discriminant. I just don't understand what the question is asking because of how it is worded. I forgot to put that =0 on the end the equation, the equation is x^2+4x + 5=0. So would the discriminant be =0 like in the equation or <0 as I worked the discriminant out to be -4?
-4<0 so it's <0
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