Question

Which of the following equations is quadratic?


x(x2 + 1) = 0
5(4x + 2) = 3
(x + 3)(x + 4) = 5

Answer 1

The third one :)

Answer 2

And how did you get to that?

Answer 3

I'll show you the solution in 5 minutes if you don't mind :)

Answer 4

ok. Sounds good.

Answer 5

First one is x(x2 + 1) = 0
Solution will be x^3+x=0
Second one is 5(4x + 2) = 3
Solution will be 20x+10=3
Third one is (x + 3)(x + 4) = 5
Solution will be x^2+4x+3x+12=2

Example of Quadratic exquation is x^2+x+3=0

The first and second is linear equation because example of linear equation is x+3=0

I hope I didn't confuse you :)

Answer 6

I think I mainly understand? But could you explain the solution to the 3rd one? Like how you got x^2+4x+3x+12=2 as the solution?

Answer 7

Sorry sorry the first is cubic,the second is linear and the third is quadratic

Answer 8

ohh. Nvm. I understand.

Answer 9

How do we get (x + 3)(x + 4) = 5 from x^2+4x+3x+12=2 though?

Answer 10

Umm listen i got it by multiplying both of them sorry the answer is x^2+4x+3x+12=5
so the final answer is x^2+7x+12=5 :)