Simplify 7x^2-2x+9+(3x^2+15x-4)

$7 x^{2} - 2 x + 9 + (3 x^{2} + 15 x - 4)$

Remove parentheses.

$7 x^{2} - 2 x + 9 + 3 x^{2} + 15 x - 4$

Add $7 x^{2}$ and $3 x^{2}$ .

$10 x^{2} - 2 x + 9 + 15 x - 4$

Add $- 2 x$ and $15 x$ .

$10 x^{2} + 13 x + 9 - 4$

Subtract $4$ from $9$ .

$10 x^{2} + 13 x + 5$

Simplify 7x^2-2x+9+(3x^2+15x-4)

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