Identify which equation is a quadratic equation.

y = 3x + 4

y + x2 = (x − 2)(x + 7)

y = −4x(x − 4) + 2x

y + 3 = (x + 12)(x2 + 2)

Question

Identify which equation is a quadratic equation. 

 y = 3x + 4 

 y + x2 = (x − 2)(x + 7) 

 y = −4x(x − 4) + 2x 

 y + 3 = (x + 12)(x2 + 2)

anonymous · Answer

Is it the first one @aamirfaisalansari  ?

anonymous · Answer

only third it can be easily obtained by solving:
1) open the bracket means multiply one to another 
2)then bring all x variable to the right hand side 
by looking at the highest power say if it is two or not
plz try it

anonymous · Answer

Okay I got it, thanks for your time.