Simplify.
20. (n^2 – 3n + 1) – (4n^2 + n – 5)
21.4y^2z(2y + 3z – 5)
22.(x – 8)(x + 5)
Please help, I need this by the end of the day, or may not pass. Please :(

Question

Simplify.
20.   (n^2 – 3n + 1) – (4n^2 + n – 5)
21.4y^2z(2y + 3z – 5)
22.(x – 8)(x + 5) 
Please help, I need this by the end of the day, or may not pass. Please :(

anonymous · Answer

20. -3 n^2 - 4 n+6

anonymous · Answer

Thank you so much, still need 21 and 22 though guys!

anonymous · Answer

21.4y^2z(2y + 3z – 5)
in this is it y square only or is it 4y raise to 2z(2y+3z-5)

22.(x – 8)(x + 5) 
Use this method -> 
(x-a)(x+b) = x(x+b)-a(x+b)
=x^2 + xb - ax -ab

Try solving