The perfect square
Let's highlight the perfect square of the square three-member
$$2 a^{2} + \left(a y + y^{2}\right)$$
Let us write down the identical expression
$$2 a^{2} + \left(a y + y^{2}\right) = \frac{7 y^{2}}{8} + \left(2 a^{2} + a y + \frac{y^{2}}{8}\right)$$
or
$$2 a^{2} + \left(a y + y^{2}\right) = \frac{7 y^{2}}{8} + \left(\sqrt{2} a + \frac{\sqrt{2} y}{4}\right)^{2}$$
General simplification
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$$2 a^{2} + a y + y^{2}$$
/ / ___\\ / / ___\\
| y*\-1 + I*\/ 7 /| | y*\1 + I*\/ 7 /|
|a - ----------------|*|a + ---------------|
\ 4 / \ 4 /
$$\left(a - \frac{y \left(-1 + \sqrt{7} i\right)}{4}\right) \left(a + \frac{y \left(1 + \sqrt{7} i\right)}{4}\right)$$
(a - y*(-1 + i*sqrt(7))/4)*(a + y*(1 + i*sqrt(7))/4)
$$2 a^{2} + a y + y^{2}$$
Rational denominator
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$$2 a^{2} + a y + y^{2}$$
$$2 a^{2} + a y + y^{2}$$
$$2 a^{2} + a y + y^{2}$$
$$2 a^{2} + a y + y^{2}$$
Combining rational expressions
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$$2 a^{2} + y \left(a + y\right)$$
Assemble expression
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$$2 a^{2} + a y + y^{2}$$