Quantitative Aptitude Algebra Quadratic Equation

క్రింది వాటిలో ఏది వర్గ సమీకరణం?

1
\(\rm -2x^2=(5-x)\left(2x-\frac{2}{5}\right)\)
2
x3 - x2 = (x - 1)3
3
\(\rm (k+1)x^2+\frac{3}{2}x=7, k=-1\)
4
x2 + 2x + 1 = (4 - x)2 + 3

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