Jika 102y = 25, maka 10-y sama dengan:(a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5​

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Jika 102y = 25, maka 10-y sama dengan:(a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5​

Jawaban:

{10}^{2y} = 25

( {10}^{y} ) {}^{2} = {5}^{2}

{10}^{y} = 5

frac{1}{10 {}^{y} } = frac{1}{5}

{10}^{ - y} = frac{1}{5}

10^2y = 25

10^y = 25½

10^y = (5²)½

10^y = 5² ½

10^y = 5¹

10^y = 5

Maka

10^-y = 1/10^y

= E. 1/5

~Opung~