(a2-3ab+2b2)+(-4a2+5ab-b2)

Remove parentheses.

a2-3ab+2b2-4a2+5ab-b2

Subtract 4a2 from a2.

-3a2-3ab+2b2+5ab-b2

Add -3ab and 5ab.

-3a2+2b2+2ab-b2

Subtract b2 from 2b2.

-3a2+b2+2ab

Add (a^2-3ab+2b^2)+(-4a^2+5ab-b^2)

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# Add (a^2-3ab+2b^2)+(-4a^2+5ab-b^2)

(a2-3ab+2b2)+(-4a2+5ab-b2)

Remove parentheses.

a2-3ab+2b2-4a2+5ab-b2

Subtract 4a2 from a2.

-3a2-3ab+2b2+5ab-b2

Add -3ab and 5ab.

-3a2+2b2+2ab-b2

Subtract b2 from 2b2.

-3a2+b2+2ab

Add (a^2-3ab+2b^2)+(-4a^2+5ab-b^2)