Answer: D: x = (-∞, ∞) R: y = (-∞, ∞)
D: x = [0, ∞) R: y = [2, ∞)
D: x = (-∞, ∞) R: y = [-3, ∞)
Explanation:
Domain is all of the x-values
Range is all of the y-values
y = 2x - 1: there is no restriction on x → x = All Real Numbers
there is no restriction on y y = All Real Numbers
y = 2 +
: x is restricted by the square root → x ≥ 0
y = 2 + (0 or greater) → y ≥ 2
y = x² - 4x + 3 : there is no restriction on x → x = All Real Numbers
quadratic equation has a minimum at vertex → y ≥ -3