Answer:
x=246 or x=-266
Explanation:
First you bring 12x to the other side and simplify to give
x²+20x+116=0
Then solve by completing the square:
(x+10)²-100+116=0
(x+10)²+16=0
(x+10)²=-16
x+10=±256
x=±256-10
Hope this helps
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