(5u-4)-(2u2-3u-4)

Apply the distributive property.

5u-4-(2u2)-(-3u)–4

Simplify.

Multiply 2 by -1.

5u-4-2u2-(-3u)–4

Multiply -3 by -1.

5u-4-2u2+3u–4

Multiply -1 by -4.

5u-4-2u2+3u+4

5u-4-2u2+3u+4

5u-4-2u2+3u+4

Combine the opposite terms in 5u-4-2u2+3u+4.

Add -4 and 4.

5u-2u2+3u+0

Add 5u-2u2+3u and 0.

5u-2u2+3u

5u-2u2+3u

Add 5u and 3u.

-2u2+8u

-2u2+8u

Simplify (5u-4)-(2u^2-3u-4)