Question

factorise: x^2-21x+108​

Answer 1

Answer:

x^2-12x-9x+108

x(x-12)-9(x-12)

(x-12)(x-9)

x=12 or x=9

Step-by-step explanation:

Answer 2

Answer:

x=(9,12)

Step-by-step explanation:

x²-21x+108=0

x²-9x-12x+108=0

x(x-9)-12(x-9)=0

(x-9)(x-12)=0

∴x=9,12