WAEC - Mathematics (2009 - No. 33)

The following is the graph of a quadratic friction, find the value of x when y = 0

1, 2

1, 4

2, 3

1, 6

when y = 0, value of x = roots of the equation

x² - 5x + 4 = 0

x = 1, 4 (see graph)