Selesaikan setiap persamaan eksponensial berikut:

a). $2^{x}$ + $2^{x+3}$ = 72
b). $3^{x}$ + $3^{x+2}$ = 90

Selesaikan setiap persamaan eksponensial berikut:

Jawaban Terkonfirmasi

$$begin{align} 2^x+2^{x+3}&=72\2^x(2^0+2^3)&=2^3times9\2^x(1+8)&=2^3times9\2^xtimesnot9&=2^3timesnot9\x&=boxed3 end$
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$$begin{align} 3^x+3^{x+2}&=90\3^x(3^0+3^2)&=3^2times10\3^x(1+9)&=3^2times10\3^xtimesnot10&=3^2timesnot10\x&=boxed2 end$