(2×2+7x)+(-x2+10x+3)

Remove parentheses.

2×2+7x-x2+10x+3

Subtract x2 from 2×2.

x2+7x+10x+3

Add 7x and 10x.

x2+17x+3

Add (2x^2+7x)+(-x^2+10x+3)

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# Add (2x^2+7x)+(-x^2+10x+3)

(2×2+7x)+(-x2+10x+3)

Remove parentheses.

2×2+7x-x2+10x+3

Subtract x2 from 2×2.

x2+7x+10x+3

Add 7x and 10x.

x2+17x+3

Add (2x^2+7x)+(-x^2+10x+3)