Question

out of the following equation which one is not a quadratic equation ?
(1)
${x}^{2} + 4x = 11 + {x}^{2}$
(2)
${x}^{2} = 4x$
(3)
$5 {x}^{2} = 90$
(4)
$2x - {x}^{2} = {x}^{2} + 5$

​

Answer 1

Answer:

Equation (4) is not a quadric equation

Answer 2

option 1 is the write answer