Log 7 (x^2 + 11) = log 7 15

x = ±2

Step-by-step explanation:

log 7 (x^2 + 11) = log 7 15

We know that log a ( b) = log a(c)   means b =c

x^2 + 11 = 15

Subtract 11 from each side

x^2 = 15-11

x^2 =4

Take the square root of each side

sqrt(x^2) =±sqrt(4)

x = ±2

Well, if you want to know the final bill of the gold chain, it's $463.55

Step-by-step explanation:

27 % of 635 is 171.45, so 635-171.45 equals to $463.55