Question 1020039
Hi there,
1) log4 (3x+4)^5=15 
(3x + 4)^5 = 4^15
(3x + 4)^5 = 1073741824
3x + 4 = 5√1073741824
3x + 4 = 64
3x = 60
x = 20
2) log (x^2-9)=log (5x+5)
As both sides logs
x^2 - 9 - 5x - 5 = 0
x^2 - 5x - 14 = 0
(x - 7)(x + 2) = 0
x - 7 = 0
x = 7
x + 2 = 0
x = -2
Hope this helps :-)