Respuesta :

Answer:

x=7+√15

x=7-√15

Step-by-step explanation:

Ver imagen Аноним
A :-) 4 ( x - 7 )^2 - 48 = 12
= 4 ( x^2 - 49 ) - 48 = 12
= 4x^2 - 196 - 48 = 12
= 4x^2 - 244 = 12
= 4x^2 = 12 + 244
= 4x^2 = 256
= x^2 = 256 by 4
= x^2 = 64
= x = _/64
= x = 8

.:. x = 8
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