Factorise x^2-21x+108 .... Please
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Answer:9,12
Step-by-step explanation:x²-21x+108=0
x²-(12+9)x+108=0
x²-12x-9x+108=0
x(x-12)-9(x-12)=0
(x-9)(x-12)=0
x=9,12
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