Q. 23.5( 19 Votes )
Which of the following equations is quadratic?
(1) x2 + 2x + 11 = 0
(2) x2 – 2x + 5 = x2
(3) (x + 2)2 = 2x2
Answer :
1. 
is a quadractic equation because it is the form of 
and it has degree 2.
2. 
∴ it is not a quadratic equation because it is not in the form of 
and it doesn’t have degree 2.
3. 
is a quadractic equation because it is the form of 
and it has degree 2.
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