Question

When you multiply a function by -1, what is the effect on its graph?

Answer 1

it’s C because it’s a transformation so it’s an exact reflection over the x-axis

Answer 2

The correct answer is C.

Explanation:

When you multiply a real function by -1 you only change its sign in all the domain of definition. The positive part becomes negative, and the negative values becomes positive and the zeros are unaltered. So, it is no difficult to see that the multiplication by -1 is equivalent to make a reflection with respect to the x - axis.