Simplify (5x+2)+(x^2-9)+(x^2-7x+12)

$(5 x + 2) + (x^{2} - 9) + (x^{2} - 7 x + 12)$

Remove parentheses.

$5 x + 2 + x^{2} - 9 + x^{2} - 7 x + 12$

Subtract $7 x$ from $5 x$ .

$- 2 x + 2 + x^{2} - 9 + x^{2} + 12$

Subtract $9$ from $2$ .

$- 2 x + x^{2} - 7 + x^{2} + 12$

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

$- 2 x + 2 x^{2} - 7 + 12$

Simplify the expression.

Add $- 7$ and $12$ .

$- 2 x + 2 x^{2} + 5$

Reorder $- 2 x$ and $2 x^{2}$ .

$2 x^{2} - 2 x + 5$

$2 x^{2} - 2 x + 5$

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