Problem: If 2x+1=82 x+1=82x+1=8, then 4x+1=4 x+1=4x+1=
Answer Choices:
A. 151515
B. 161616
C. 171717
D. 181818
E. 191919
Solution:
4x+1=2(2x+1)−1=2⋅8−1=154 x+1=2(2 x+1)-1=2 \cdot 8-1=154x+1=2(2x+1)−1=2⋅8−1=15. Or, solve 2x+1=82 x+1=82x+1=8 to obtain x=7/2x=7 / 2x=7/2. Thus 4x+1=4(7/2)+1=154 x+1=4(7 / 2)+1=154x+1=4(7/2)+1=15.