Answer:
3
Step-by-step explanation:
X2+-4x+4=20 the final answer is 20!
Answer: (u^2+1) * (u-2) * (u+2)
Answer:
N = 3
Step-by-step explanation:
I don't know what the whole thing above is, but just disregard that.
All it is here is cross multiplication.
So 28N = 21 * 4
Multiply...
28N = 84
And divide each side by 28
N = 3