Question

Which of the following functions has a range of all real numbers?
A. y= -7x + 2
B. y= 4x^2 - 1
C. y= -3x^2 + 5
D. y= 6 (2^x)

Answer 1

First: what does "range" mean in this context?

Answer 2

The subtraction of smalles and largest number

Answer 3

@mathmale

Answer 4

Range means the list of all possible y values.

Answer 5

Is it C?? @greatlife44

Answer 6

The only function that has a range of all real numbers is A.

\[\mathbb{R} , all~real~numbers\]

because you can get any y value that's from

\[(-\infty, \infty)\]

Answer 7

yes

note that x^2 cannot be negative for real values of x
so the last 3 options range is not all real numbers