Does the point (0, 10) lie on the line y = 2x + 10?
A. Yes, because 0 = 2(10) + 10.
B. Yes, because 10 = 20 + 10.
c. No, because 0 € 2(10) + 10.
D. No, because 10 + 200 + 10.

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

use a calculator or a graph