/ / ____\\ / / ____\\
| x*\1 - I*\/ 59 /| | x*\1 + I*\/ 59 /|
|b - ----------------|*|b - ----------------|
\ 30 / \ 30 /
$$\left(b - \frac{x \left(1 - \sqrt{59} i\right)}{30}\right) \left(b - \frac{x \left(1 + \sqrt{59} i\right)}{30}\right)$$
(b - x*(1 - i*sqrt(59))/30)*(b - x*(1 + i*sqrt(59))/30)
General simplification
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$$15 b^{2} - b x + x^{2}$$
The perfect square
Let's highlight the perfect square of the square three-member
$$15 b^{2} + \left(- b x + x^{2}\right)$$
Let us write down the identical expression
$$15 b^{2} + \left(- b x + x^{2}\right) = \frac{59 x^{2}}{60} + \left(15 b^{2} - b x + \frac{x^{2}}{60}\right)$$
or
$$15 b^{2} + \left(- b x + x^{2}\right) = \frac{59 x^{2}}{60} + \left(\sqrt{15} b - \frac{\sqrt{15} x}{30}\right)^{2}$$
Rational denominator
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$$15 b^{2} - b x + x^{2}$$
$$15 b^{2} - b x + x^{2}$$
Combining rational expressions
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$$15 b^{2} + x \left(- b + x\right)$$
$$15 b^{2} - b x + x^{2}$$
Assemble expression
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$$15 b^{2} - b x + x^{2}$$
$$15 b^{2} - b x + x^{2}$$
$$15 b^{2} - b x + x^{2}$$