1) 1,3^(3x-2) = 33x - 2 = log1,3(3)3x - 2 = 13x = 3x = 1
2) 25^x + 2 * 5^x - 15 = 0(5^x)^2 + 2(5^x) - 15 = 0Let y = 5^xy^2 + 2y - 15 = 0(y + 5)(y - 3) = 0y = -5, 35^x = -5 (no real solution)5^x = 3x = log5(3)
3) 16^x - 4^x + 1 - 14 = 0(4^x)^2 - 4^x - 13 = 0Let y = 4^xy^2 - y - 13 = 0y = (1 ± √(1 + 4*13))/2y = (1 ± √53)/24^x = (1 ± √53)/2x = log4((1 ± √53)/2)
1) 1,3^(3x-2) = 3
3x - 2 = log1,3(3)
3x - 2 = 1
3x = 3
x = 1
2) 25^x + 2 * 5^x - 15 = 0
(5^x)^2 + 2(5^x) - 15 = 0
Let y = 5^x
y^2 + 2y - 15 = 0
(y + 5)(y - 3) = 0
y = -5, 3
5^x = -5 (no real solution)
5^x = 3
x = log5(3)
3) 16^x - 4^x + 1 - 14 = 0
(4^x)^2 - 4^x - 13 = 0
Let y = 4^x
y^2 - y - 13 = 0
y = (1 ± √(1 + 4*13))/2
y = (1 ± √53)/2
4^x = (1 ± √53)/2
x = log4((1 ± √53)/2)