Check whether the following equations are quadratic or not. (I) 3x²=x+4 (ii) x²+x-12=0 (iii) x²-3x-2√x-1=0 (iv) x²-5x=0 (v)x²-1/x²=3 (vi) x/2+6/x=5 (vii) 2(x²+1)=5x (viii)x³-4x²-7x+3=0 (ix) (5x+1)(2x+3)=(10x+1)(x+2) (x) x/x-1+x-1/x-5/2=0
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