Question

[Mun]

a. 5^x . 5¹⁴ = 5⁷⁸

b. 7^x . 49 = 7²⁷           

^{mn ơi giúp mik vớiiiii}

Answer 1

[Wind]

\(a,\text{ }5^x\cdot5^{14}=5^{78}\)

\(5^{14+x}=5^{78}\)

\(\Rightarrow\text{ }14+x=78\)

\(x=78-14\)

\(x=64\)

Answer 2

[Wind]

\(b,\text{ }7^x\cdot49=7^{27}\)

\(7^x\cdot7^2=7^{27}\)

\(7^{2+x}=7^{27}\)

\(\Rightarrow\text{ }2+x=27\)

\(x=27-2\)

\(x=25\)