Question 51988
intercepts mean th x's values when the y = 0.


0=x^2-9x+20
0=x^2-5x-4x+20
0=x(x-5)-4(x-5)
0=(x-4)(x-5)

so either one this must be zero

x-4 = 0    or     x-5=0
x= 4       or       x=5