Simplify (3x+5x^2-1)+(13-20x+x^2)

$(3 x + 5 x^{2} - 1) + (13 - 20 x + x^{2})$

Remove parentheses.

$3 x + 5 x^{2} - 1 + 13 - 20 x + x^{2}$

Subtract $20 x$ from $3 x$ .

$- 17 x + 5 x^{2} - 1 + 13 + x^{2}$

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

$- 17 x + 6 x^{2} - 1 + 13$

Simplify the expression.

Add $- 1$ and $13$ .

$- 17 x + 6 x^{2} + 12$

Reorder $- 17 x$ and $6 x^{2}$ .

$6 x^{2} - 17 x + 12$

$6 x^{2} - 17 x + 12$

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