Number 6 needs to be in set notation and number 9 needs to be in interval notation. I'm confused about the last two. Please explain because I need to understand these. Sorry.
+130071 6.
D = (-inf, - 4) U (-4, inf)
R = (-inf, 2) U (2, inf)
Function because it passes the vertical line test
9.
D = x < -1 U x > -1
R = y < - 4 U y > - 4
Function because it passes the vertical line test
20.
k ( -δw) = -2(-δw) - 15
__________
(-δw) + 9
21. t(x + 4) = ( x + 4)^3 + 2(x + 4) =
(x + 2)^2 (x + 4) + 2x + 8 =
(x^2 + 4x + 16) (x + 4) + 2x + 8 =
x^3 + 4x^2 + 16x + 4x^2 + 16x + 64 + 2x + 8 =
x^3 + 8x^2 + 34x + 72
