The movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on y Find the perimeter and area of the polygon shown below.
148 ft-
15 ft
D
17ft
16 ft
P = 87 feet, A = 360 square feet
P = 56 feet, A = 308 square feet
P = 72 feet, A = 300 square feet
P = 72 feet, A = 308 square feet

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81