Which of the following is not a quadratic equ | vedclass

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Question

(C) quadratic equation is an equation of the form $ax^2 + bx + c = 0$,where $a 
eq 0$.Let us simplify each option:$A$: $x(3x + 7) = (x + 1)(x - 1) \i

Vedclass · Accepted Answer

$2x(3x - 5) + 1 = 3x(2x + 5) + 3$

Vedclass · Answer

(C) quadratic equation is an equation of the form $ax^2 + bx + c = 0$,where $a 
eq 0$.Let us simplify each option:$A$: $x(3x + 7) = (x + 1)(x - 1) \implies 3x^2 + 7x = x^2 - 1 \implies 2x^2 + 7x + 1 = 0$. This is a quadratic equation.$B$: $x^2 - 2x + 1 = 0$. This is already in the form $ax^2 + bx + c = 0$ with $a = 1$. This is a quadratic equation.$C$: $2x(3x - 5) + 1 = 3x(2x + 5) + 3 \implies 6x^2 - 10x + 1 = 6x^2 + 15x + 3 \implies -10x + 1 = 15x + 3 \implies 25x + 2 = 0$. This is a linear equation,not a quadratic equation.$D$: $4 - 3x - 2x^2 = 0$. This is a quadratic equation with $a = -2$.

Which of the following is not a quadratic equation?

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