Write in Standard Form (3x^2-10x+4)+(10x^2-5x+8)

$(3 x^{2} - 10 x + 4) + (10 x^{2} - 5 x + 8)$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c$

Add $3 x^{2}$ and $10 x^{2}$ .

$13 x^{2} - 10 x + 4 - 5 x + 8$

Subtract $5 x$ from $- 10 x$ .

$13 x^{2} - 15 x + 4 + 8$

Add $4$ and $8$ .

$13 x^{2} - 15 x + 12$