Question

Which of the following are the roots of the quadratic equation x’2- 9x +20 =0 by factorisation?

Answer 1

Step-by-step explanation:

x^2-9x+20=0

x^2-5x-4x+20=0

x(x-5)-4(x-5)=0

(x-5)(x-4)=0

x-5=0 or x-4=0

x=5 or x=4

5 and 4are roots of equation.