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(11-2a) ²+(-a-2) ²=50
121-4a²-44a+a²+4+4a=50
-3a²-40a+125-50=0
3a²+40a-75=0
3a²+(45-5) a-75=0
3a²+45a-5a-75=0
3a(a+15) -5(a-15) =0
(3a-5) (a-15) =0
therefore a=5/3 & a=15
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