The area behind the house is care dirt, so the owners purchase sod to cover the area inside the picket fence. Find the number of square feet of sod which must be purchased to the nearest square foot. Note the fire ring is brick, the patio is cement, don't put the sod on them. The fire ring measures 10 feet across the center, what is the circumference? the patio is 16 ft x 24 ft. the picket fence reads 45 ft, 45 ft 18 ft,18 feet

nope

step-by-step explanation:

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

yep b and c r the correct got it! : )