Answer:
2
Step-by-step explanation:
The width of the graph depends upon the y value (function value).
If you're interested in the width of the graph measured ON the x-axis, then we need to find the roots and then find the distance between them.
Multiplying as indicated, your y= -2.8x(x-2) becomes y = -2.8x^2 + 5.6x. This factors as follows: -2.8x^2 + 5.6x = y = x(-2.8x + 5.6) = 0
Then either x = 0 or x = 2.
The distance between these two roots is 2, as measured along the x-axis. This is the width of the parabola for y = 0 (along the x-axis).
