Question

Which is not a quadratic equation?
(a) 2x² -9=0 (b) (3x² – 5x+7=0
(c) (x + 1)(x – 3) = 0 (d) x + = 2
​

Answer 1

(d) is not a quadratic equation.

HOPE THIS COULD HELP!!!

Answer 2

HEYA USER ❤️

Standard quadratic equation is :

ax²+bx+c=0

2x²+0x+(-9)=0

Yes, it is quadratic equation ( but incomplete )

3x²+(-5x)+7=0

yes, it is a complete quadratic equation.

(x+1)(x-3)

x(x-3)+1(x-3)

x²-3x+x-3

x²-2x-3

yes, it is also a complete quadratic equation.

x=2 ( your given equation is incomplete ).

Answer : (d). and (a)