tentukan nilai x dan pertanian (1/25)^x2 = 5^x-1

Bab Eksponensial
Matematika SMP Kelas IX

(1/25)^x² = 5^(x - 1)
(5⁻²)^x² = 5^(x - 1)
-2x² = x - 1
2x² + x - 1 = 0
(2x - 1) (x + 1) = 0
2x - 1 = 0   atau x + 1 = 0
x = 1/2               x = -1

HP = {-1, 1/2}