1.

Solve the equation: `x^2+3=0`

Answer» (i) `x^2= -3`
`x= +- sqrt3`
`= +-isqrt3`
(ii)` 2x^2+x+1=0`
`D= b^2-4ac = 1-4*2*1 = -7`
`x= (-b+-sqrt D)/(2a)`
`=(-1+- sqrt7)/4`


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