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Check whether the following equations are quadratic or not.
\( \mathrm{P} \)
(i) \( x+\frac{3}{x}=x^{2} \)
(ii) \( 2 x^{2}-5 x=x^{2}-2 x+3 \)
(iii) \( x^{2}-\frac{1}{x^{2}}=5 \)
(iv) \( x^{2}-3 x-\sqrt{x}+4=0 \)
(v) \( x(2 x+3)=x+2 \)
(vi) \( (x-2)^{2}+1=2 x-3 \)
(vii) \( y(8 y+5)=y^{2}+3 \)
(viii) \( y(2 y+15)=2\left(y^{2}+y+8\right) \)
(ix) \( (x+2)(x-2)=(x+3)(x+4) \)
\( (x)(2 x-1)^{2}-4 x^{2}+5=0 \)
(xi) \( \frac{16}{x}-1=\frac{15}{x+1} \)
(xii) \( \frac{1}{(x-1)(x-2)}+\frac{1}{(x-2)(x-3)}=\frac{2}{3} \)
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