Yes, because a negative number multiply by itself it is positive.
Answer:
Step-by-step explanation:
The trigonometric function that needs a domain restriction of ![[-\frac{\pi}{2},\frac{\pi}{2} ]](https://tex.z-dn.net/?f=%5B-%5Cfrac%7B%5Cpi%7D%7B2%7D%2C%5Cfrac%7B%5Cpi%7D%7B2%7D%20%5D)
to make it invertible is .
The function will pass the horizontal line test on this interval therefore making it an invertible function on this interval.
This explains why the inverse tangent function, 
has range .
Answer:
y = - 7x - 26
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Here m = - 7, thus
y = - 7x + c ← is the partial equation of the line
To find c substitute (- 5, 9) into the partial equation
9 = 35 + c ⇒ c = 9 - 35 = - 26
y = - 7x - 26 ← equation of line
