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\frac{\sqrt{3}}{2}+x^{2}+x\times 2\sqrt{10}
Factor 40=2^{2}\times 10. Rewrite the square root of the product \sqrt{2^{2}\times 10} as the product of square roots \sqrt{2^{2}}\sqrt{10}. Take the square root of 2^{2}.
\frac{\sqrt{3}}{2}+\frac{2\left(x^{2}+x\times 2\sqrt{10}\right)}{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply x^{2}+x\times 2\sqrt{10} times \frac{2}{2}.
\frac{\sqrt{3}+2\left(x^{2}+x\times 2\sqrt{10}\right)}{2}
Since \frac{\sqrt{3}}{2} and \frac{2\left(x^{2}+x\times 2\sqrt{10}\right)}{2} have the same denominator, add them by adding their numerators.
\frac{\sqrt{3}+2x^{2}+4x\sqrt{10}}{2}
Do the multiplications in \sqrt{3}+2\left(x^{2}+x\times 2\sqrt{10}\right).
\frac{\sqrt{3}+2x^{2}+4\sqrt{10}x}{2}
Factor out \frac{1}{2}. Polynomial \sqrt{3}+2x^{2}+4\sqrt{10}x is not factored since it does not have any rational roots.