Question

Se define la operación: a © b=ab+b - a Halla "x" en: 5 © x=(7 © 4) © 10

Answer 1

 a © b=ab+b - a = 7 © 4 = 7 x 4 +4 -7
28+4-7
32-7
25©10
25 x 10 +10 -25
250+10-25
260-25
235

Answer 2

5©x = (7©4)©10 <= aplicando definición.
5x+x-5 = (7(4)+4-7) ©10
6x-5 = 25 © 10
6x-5 = 25(10)+10-25
6x-5 = 250-15
6x-5 = 235
6x = 240
x = 240/6
x = 40 <=== Rpta.