Find-the-first-four-values-of-2x-5-1-mod-7-

Question Number 140449 by byaw last updated on 07/May/21

Find the first four values of

2 x + 5 = 1 (\mod 7)

Answered by Rasheed.Sindhi last updated on 08/May/21

2 x + 5 = 1 (\mod 7)

2 x \equiv 1 - 5 = - 4 (m o d 7)

\frac{2 x}{2} \equiv \frac{\overset{- 2}{- 4}}{2} (m o d 7)

x \equiv - 2 + 7 (m o d 7)

x \equiv 5 (m o d 7)

x \equiv 5 \equiv 12 \equiv 19 \equiv 26 (m o d 7)

5, 12, 19, 26, \dots