Question

x2 - 18x + 81 = ?
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Answer 1

Step-by-step explanation:

${x}^{2} - 18 x+ 81\\ \\ = {x}^{2} - 9x - 9x + 81 \\ \\ = x(x - 9) - 9(x - 9) \\ \\ = (x - 9)( x- 9) \\ \\ = (x - 9) ^{2}$

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x - 9 = 0

→ x = 9

..................................................................

x - 9 = 0

→ x = 9

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x = 9 , 9

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Answer 2

Answer:

x^2 - 18x + 81

x^2 -9x -9x + 81

x(x-9)-9(x-9) by factorise

(x-9) (x-9)

x =9 x =9

THE ANSWER IS (X-9)^2

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