Question

$( {x}^{2} - 7x + 12) \div (x - 3)$

Answer 1

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Here is your answer.
__________
x-3)x^2-7x +12 ,( x - 4
(-) x^2-3x
------------
-4x + 12
( -) -4x ,+ 12
---------------
0

Therefore x - 4 is your answer

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Answer 2

Here is your answer

$( {x}^{2} - 7x + 12) \div (x - 3) \\ \\ = x - 4$
Hope it helps