Decide which of the following are quadratic equations.
(1) x2 + 5x – 2 = 0
(2) y2 = 5y - 10
(3) 
(4) 
(5) (m + 2)(m–5) = 0
(6) m3 + 3m2 – 2 = 3 m3
1. 
is a quadractic equation because it is the form of 
and it has degree 2.
2. 
∴ it is a quadratic equation because it is the form of 
and it has degree 2.
3. 
⇒ 
∴ it is not a quadratic equation because it is not in the form of 
and it does not have degree 2.
4. 
∴ it is a quadratic equation because it is the form of 
and it has degree 2.
5. 
⇒
∴ it is a quadratic equation because it is the form of 
and it has degree 2.
6. 
⇒ 
∴ it is not a quadratic equation because it is not in the form of 
and it does not have degree 2.
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