Question

What is the range of y = 2x2 - 4?
A. y ≥ 2
B. y ≥ -4
C. y ≤ -4
D. y: all real numbers

Answer 1

the range is what y values you can get.

2*x*x where x is any number will always be positive. if x is -1, you would get 2*-1*-1 = +2
if x is 1 you would get 2*1*1 which is +2

the smallest 2*x*x can be is 0 , when x is 0

that means the smallest that y will be is 0 - 4= -4

using the equation y= 2*x*x -4

can you answer the question ?

Answer 2

y is equal to or greater than negative 4?

Answer 3

yes. written as y ≥ -4

Answer 4

ok thank you