Question

Which of the following equations is quadratic?

Answer 1

Answer:

I think it's 2 because the quadratic equation looks like this ax^2+bx+c=0 and option 2 looks like it.

Step-by-step explanation:

For option 1: x(x^2+1)=0

x^3+1=0     ( This also does not look like the quadratic function, so it couldn't be the answer)

For option 2: (x+3)(x+4)=5

x^2+3x+3x+12=5

x^2+6x+12=5     ( This does look like the quadratic function, so it could be the answer)

For option 3:

5(4x+2)=3

20x+10=3     ( This also does not look like the quadratic function, so it couldn't be the answer)

Answer 2

Answer:

the first one

x(x2 + 1)= 0