$y^{2}$ (x+y)p+$x^{2}$ (x+y)q=($y^{2}$+$x^{2})$z
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Investigate the equation: \({y}^{2} \left(x + y\right) \cdot p + {x}^{2} \left(x + y\right) \cdot q = \left({y}^{2} + {x}^{2}\right) \cdot z\).
$y^{2}$ (x+y)p+$x^{2}$ (x+y)q=($y^{2}$+$x^{2})$z
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