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a#b = 2a+3b
(5x+1)#9 = 2(5x+1) + 3(9) = 69
10x + 2 + 27 = 69
10x + 29 = 69
10x = 69 - 29 = 40
x = 40/10 = 4
x = 4
E = √(3x² + 1) = √(3(4)² + 1) = √(3(16) + 1) = √(48 + 1)
= √49 = 7
E = 7
Saludos!