A square with side length
c
cc has an area of
81
8181 square centimeters. The following equation shows the area of the square.
c
2
=
81
c
2
=81c, squared, equals, 81
What is the side length of the square in centimeters?

dsfdsf

step-by-step explanation:

fddsf

answer

you start with $5 and save $10 a week until you have at least $45wer

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