Question

which of the following is not a quadratic equation.
a
$2x {}^{2} - x {}^{2} = x {}^{2} + 5$
b
$7x = 2x {}^{2}$
c
$(x + 1) {}^{3} = x {}^{3}$

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Answer 1

c is not a quadratic equation

Answer 2

Heya❤

option (a) is not a quadratic equation.

Because,

$2x {}^{2} - x {}^{2} = x {}^{2} + 5 \\ x {}^{2} = x {}^{2} + 5 \\ x {}^{2} - x {}^{2} - 5 = 0$

Hope it helps you

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