Question

if 3 by8 power minus -5 into 16 by 21 power minus -5 equal to 2 by 7 power x, find x power 3. ​

Answer 1

$\huge\underline \mathfrak \red{Answer}$.

$( \frac{3}{8} ) {}^{ - 5} \times (\frac{16}{21} ){}^{ - 5} = (\frac{2}{7} ) {}^{x}$

$( \frac{3 \times 16}{8 \times 21} ) {}^{ - 5} = (\frac{2}{7} ) {}^{x}$

$( \frac{21 \times 8}{3 \times 16} ) {}^{5} = (\frac{2}{7} ) {}^{x}$

$( \frac{168}{48} ) {}^{5} = (\frac{2}{7} ) {}^{x}$

$( \frac{7}{2} ) {}^{5} = ( \frac{2}{7} ) {}^{x}$

$( \frac{2}{7} ) {}^{ - 5} = (\frac{2}{7} ) {}^{x}$

$- 5 = x \\ x = - 5$

$<marquee direction> Thank You$

Answer 2

Answer:

x= -5

hope it might helps you