Question

find x............. ques no 10th b

Answer 1

Hey dear!

Here is yr answer.....

10. b)

$= > (\frac{ - 1}{3} )^{ - 18} \div ( \frac{ - 1}{3} )^{7} = (\frac{ - 1}{3} )^{ - 2x + 1} \\ \\ = > { - 3}^{18} \times { - 3}^{7} = { - 3}^{2x - 1} \\ \\ = > { - 3}^{18 + 7} = { - 3}^{2x - 1} \\ \\ = > { - 3}^{25} = { - 3}^{2x - 1} \\ \\ bases \: are \: same \: so \: the \: powers \: must \: be \: equal \\ \\ = > 25 = 2x - 1 \\ \\ = > 2x = 25 + 1 \\ \\ = > 2x = 26 \\ \\ = > x = \frac{26}{2} \\ \\ = > x = 13$

Hope it hlpz...