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
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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
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