Simplify 7x^2-y+4(x^3+9y)

$7 x^{2} - y + 4 (x^{3} + 9 y)$

Simplify each term.

Apply the distributive property.

$7 x^{2} - y + 4 x^{3} + 4 (9 y)$

Multiply $9$ by $4$ .

$7 x^{2} - y + 4 x^{3} + 36 y$

$7 x^{2} - y + 4 x^{3} + 36 y$

Simplify by adding terms.

Add $- y$ and $36 y$ .

$7 x^{2} + 4 x^{3} + 35 y$

Reorder $7 x^{2}$ and $4 x^{3}$ .

$4 x^{3} + 7 x^{2} + 35 y$

$4 x^{3} + 7 x^{2} + 35 y$

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