Question

Which of the following equations cannot have x=7as the solution? a) 2x+1=15 b) 7x−1=50 c) x−3=4 d) x7−1=0

Answer 1

Answer:

(d)x7-1=0

solution :x=1/7

Answer 2

Answer:

A) √

B) ×

C) √

D) ×

Step By Step  

A) LHS ( Left Hand Side)      

    =15-1                                  

    =14

    =2x - 14

    =x - 14/2

    =7 √

B) LHS ( Left Hand Side)

    =50+1

    =51

    =7x - 51

    =x - 51/7

    =7.28571428571 ×

C) LHS ( Left Hand Side)

    =4+3

    =7 √

D) LHS ( Left Hand Side)

   =0+1

   = 1/7 ×