(3×2-4x+8)+(-x2-2x-8)

Remove parentheses.

3×2-4x+8-x2-2x-8

Subtract 8 from 8.

3×2-4x-x2-2x+0

Add 3×2-4x-x2-2x and 0.

3×2-4x-x2-2x

3×2-4x-x2-2x

Subtract x2 from 3×2.

2×2-4x-2x

Subtract 2x from -4x.

2×2-6x

Add (3x^2-4x+8)+(-x^2-2x-8)

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# Add (3x^2-4x+8)+(-x^2-2x-8)

(3×2-4x+8)+(-x2-2x-8)

Remove parentheses.

3×2-4x+8-x2-2x-8

Subtract 8 from 8.

3×2-4x-x2-2x+0

Add 3×2-4x-x2-2x and 0.

3×2-4x-x2-2x

3×2-4x-x2-2x

Subtract x2 from 3×2.

2×2-4x-2x

Subtract 2x from -4x.

2×2-6x

Add (3x^2-4x+8)+(-x^2-2x-8)