Question

Solve the given equation by the trial and error method:
2x + 5 = 13

• A. 3
• B. 4
• C. 8
• D. 11

Answer 1

The correct option is B 4

The given equation is: 2x + 5 = 13

If x = 1, 2x + 5 = 2 $\times$ 1 + 5 = 7.
If x = 2, 2x + 5 = 2 $\times$ 2 + 5 = 9
If x = 3, 2x + 5 = 2 $\times$ 3 + 5 = 11.
If x = 4, 2x + 5 = 2 $\times$4 + 5 = 13. (LHS = RHS)
Therefore, x = 4 holds good for the given equation.