How to simplify the expression

√(x²+10x+25)

= √[(x)^2+2×x×5+(5)^2]

= √(x+5)^2

= (x+5)

The answer is (x+5)

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers