Jawabanmu

2014-09-05T23:18:15+07:00
3^x+4 × 5^x+1 × 15^2x-1 = 3^x+4 × 5^x+1 × (3 × 5)^2x-1 = 3^x+4 × 5^x+1 × 3^2x-1 × 5^2x-1 =3^3x+3 × 5^3x