Jill is trying to solve the following quadratic equation by completing the square: $$x^2 - 8x - 49 = 0.$$She rewrites this equation in the form of $(ax + b)^2 + c,$ where $a,$ $b,$ and $c$ are integers. What is $ab$?
<|im_start|>system
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<|im_start|>user
Jill is trying to solve the following quadratic equation by completing the square: $$x^2 - 8x - 49 = 0.$$She rewrites this equation in the form of $(ax + b)^2 + c,$ where $a,$ $b,$ and $c$ are integers. What is $ab$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
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Jill is trying to solve the following quadratic equation by completing the square: $$x^2 - 8x - 49 = 0.$$She rewrites this equation in the form of $(ax + b)^2 + c,$ where $a,$ $b,$ and $c$ are integers. What is $ab$?
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