8.
Mixed Practice: Simplify the expressions and express as a polynomial in standard form:
4. -3x(9x-4)
5.x(2x^2+x) 6. -5x^2-4x+1) 7. (3x-5y+z)-(2x-4y-z)
![8 Mixed Practice Simplify the expressions and express as a polynomial in standard form 4 3x9x4 5x2x2x 6 5x24x1 7 3x5yz2x4yz class=](https://us-static.z-dn.net/files/d7f/a917ae0bafc98f65b27cc18efbb25517.png)