Answer:
This is true
Step-by-step explanation:
10x1 is 10. 10x10 is 100. but if u did 100x10 you would add the amount of zeros total. which would be 1000. so 400x10 is 4000
x^2 + 4x + 3 + 1 = (x + 2)^2
So 1 need to be added.
Answer:
its A
Step-by-step explanation: