Top: -x
Bottom: x
Just find the points where the sloped of the line changes. First, the slope is -x, and then it changes to +x
Answer:
Below.
Step-by-step explanation:
a. Φ^2 − Φ − 1 = 0
Φ2 − Φ = 1
(Φ - 0.5)^2 - 0.25 = 1
(Φ - 0.5)^2 = 1.25
Φ - 0.5 = √(1.25) (We only take the positive root).
Φ = 0.5 + √(1.25)
b. I used Completing the square.
c. Φ is irrational That is it cannot be represented as a fraction a/b and because of this it can only be approximated by a decimal.
True.
You're allowed to move stuff around. Dogs of the AMS.

We wrote it in the form dy/dx = g(x) f(y) so this is separable.