Find all roots of x2−15x+56x^2 - 15x + 56x2−15x+56.
x=7x = 7x=7 and x=8x = 8x=8
x=4x = 4x=4 and x=14x = 14x=14
x=2x = 2x=2 and x=28x = 28x=28
x=5x = 5x=5 and x=11.2x = 11.2x=11.2