$-10x2 +3 = 0$
.

Result

x1 =  0.55
x1 =  -0.55

#### Solution:

$ -10x^2 +3 = 0 \ \\ -10x^2 = -3 \ \\ x^2 = 0.3 \ \\ x_1 = \sqrt{ 0.3 } = 0.55$
$x_2 = - \sqrt{ 0.3 } = -0.55$

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