Answer:
The sign becomes flipped.
If it's a negative it becomes a positive, if it's a positive then it becomes a negative.
Answer:
Its graph is reflected over the x-axis.
Step-by-step explanation:
Multiplying a function by a value gives it a vertical scale factor of that value. When the value is negative, the function's graph is reflected over the x-axis (as well as being scaled).
Multiplying a function by -1 reflects its graph over the x-axis.
