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= 2^3
Jika kedua ruas di akar pangkat 3 kn,
Maka akan didapat :
5^x = 2. ... (1)
Kembali ke pertanyaan :
5^(3+x) = 5^3 * 5^x. ... (2)
Substitusikan persamaan (1) ke (2)
Maka,
5^(3+x) = 5^3 * 2
= 125 * 2
= 250 (d)