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In each of the following, determine whether the given values are solutions of the given equation or not: `2x^2-x+9=x^2+4x+3,\ \ x=2,\ \ x=3` (ii) `x^2-sqrt(2)x-4=0,\ \ x=-sqrt(2),\ \ x=-2sqrt(2)` (iii) `a^2x^2-3a b x+2b^2=0,\ \ x=a//b ,\ \ x=b//a`

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