Which statements about the graph of the function f(x) = -x2 - 4x + 2 are true? Select three options.
The domain is {x|x <-2}.
The range is fyly s 6).
The function is increasing over the interval (-00,-2).
The function is decreasing over the interval (-4, c).
The function has a positive y-intercept.

step-by-step explanation:

just sum

10 + 10 = 20

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