Question

Solve x + 8 = 20 by trial and error method.

• A. 3
• B. 12
• C. 14
• D. 28

Answer 1

The correct option is B 12

Given that x + 8 = 20
By trial and error method , we have
If x = 3
Then LHS = 3 + 8 = 11
RHS = 20
Hence LHS $\ne$ RHS

If x = 14
Then LHS = 14 + 8 = 22
RHS = 20
Hence LHS $\ne$ RHS

If x = 28
Then LHS = 28 + 8 = 36
RHS = 20
Hence LHS $\ne$ RHS

If x = 12
Then LHS = 12 8 = 20
RHS = 20
Hence LHS = RHS
Hence the solution of the equation is x = 12