Question

6.
Out of the following equations which one is not a quadratic equation ?
(A) x2 + 4x = 11 + r. (B) x = 4x (C) 5.x = 90 (D) 2r - r= r + 5​

Answer 1

A ) x² + 4x = 11 + x²

4x = 11

degree = 1

not a quadratic equation.

B ) x² = 4x

divide both sides with x , we get

x = 4

degree = 1

not a quadratic equation.

C ) 5x² = 90

degree = 2

quadratic equation.

D ) 2x - x² = x² + 5

2x = 2x² + 5

degree = 2

quadratic equation.

Therefore ,

Option ( A ) , and ( B) are not quadratic