निम्न समीकरणों की जाँच कर बताइए कि क्या ये द्विघात समीकरण है:
(i) x(x+1) +8 = (x+2)(x-2)
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(x+1)^(2)=2(x-3) (II) x^(2)-2x=-2(3-x) <br> (Iii) (x-2)(x+1)=(x-1)(x+3) (Iv) (x-3)(2x+1)=x(x+5) <br> (वी) (2x-1)(x-3)=(x+5)(x-1) (Vi) x^(2)+3x+1=(x-2)^(2) <br> (Vii) (x+2)^(3)=2x(x^(2)-1) (ज) x^(3)-4x^(2)-x+1=(x-2)^(3)
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