Okay, I am in 11th grade and need help on a math question. I am currently doing online school and I am in the middle of a quiz but got stumped on a particular question.. I am learning about Quadratic Equations, and Discriminants.. I understand how to do them for example, I understand equations like 7x^2 + 2x - 4
or x^2 - x + 9.. that's all easy.. but when it starts getting to x^2 - 7x or x^2 - 11x = 0... I don't understand them.. do those equations have c? Please help

** ^= exponent

Question

Okay, I am in 11th grade and need help on a math question. I am currently doing online school and I am in the middle of a quiz but got stumped on a particular question.. I am learning about Quadratic Equations, and Discriminants.. I understand how to do them for example, I understand equations like 7x^2 + 2x - 4 
or x^2 - x + 9.. that's all easy.. but when it starts getting to x^2 - 7x or x^2 - 11x = 0... I don't understand them.. do those equations have c? Please help

** ^= exponent

jim_thompson5910 · Answer

yes, in those last two cases, c = 0

jim_thompson5910 · Answer

since 

$$\Large x^2 - 7x$$

is the same as

$$\Large x^2 - 7x+0$$

jim_thompson5910 · Answer

and because 

$$\Large x^2 - 11x = 0$$

is the same as 

$$\Large x^2 - 11x +0 = 0$$

happinessbreaksbones · Answer

Wow, you are amazing Jim.. Thank you sooo much, I can't believe I didn't get that. You are awesome.. I would of asked my online teachers this question but they are soo unreliable. Thank you again, Jim. God Bless.

jim_thompson5910 · Answer

you're welcome

happinessbreaksbones · Answer

:)

jim_thompson5910 · Answer

I'm glad I could help you out