Simplify 4x^2+3y^2-4y+5y^2+5x^2

$4 x^{2} + 3 y^{2} - 4 y + 5 y^{2} + 5 x^{2}$

Add $4 x^{2}$ and $5 x^{2}$ .

$9 x^{2} + 3 y^{2} - 4 y + 5 y^{2}$

Add $3 y^{2}$ and $5 y^{2}$ .

$9 x^{2} + 8 y^{2} - 4 y$

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