a) x² -10x+9

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Answer:
x² - 10x +9 = 0
⇒ x² -x -9x +9 = 0
⇒ x(x-1) -9(x-1) = 0
⇒ (x-1)×(x-9) = 0
⇒ x = 1 OR x= 9
Explanation:
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