Let D={6,9,11}, E={6,8,9,10} and F={5,7,8,9,11} List the elements in the set D U E.
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9p^2 - 6 = 642; / + 6 ;
9p^2 = 648; / ÷9 ;
p^2 = 72 ;
p = +
;
Finally, p = +6
or p = -6
9p^2 = 648; / ÷9 ;
p^2 = 72 ;
p = +
Finally, p = +6