Directions: Simplify each algebraic expression by combining like terms.

1. 7x2 - 5x + 10x - 8x?

2.-6a3 + 5a3 + 2a? - a?

3. - 4 (x + 5) - 5 (x - 1)

4. - a + 5b - 6a + 5 (a + 1)

5. 18x4 - 3x3 - 2x3 + x2 - 10 + 6

Step-by-step explanation:

1) 7x^2-5x+10x-8x=7x^2+5x-8x=7x^2-3x

2) - 6a^3+5a^3+2a-a=-a^3+2a-a=-a^3+a

3) - 4 (x+5) - 5 (x-1) = -4x-20-5x+5=-9x-20+5=-9x-15

4) - a+5b-6a+5 (a+1) = -7a+5b+5a+5=-2a+5b+5

5) 18x^4-3x^3-2x^3+x^2-10+6

=18x^4-5x^3+x^2-4