Question
Solve the following equation by trial and error method: $4x = 28$
✓
Answer
The given equation is $4x = 28$ We guess and try several values of $x$ to find $L.H.S.$ and $R.H.S.$ and stop when $L.H.S. = R.H.S.$
When $x = 7,$
we have $L.H.S. = R.H.S$
So $x = 7$ is the solution of the given equation.
| x | L.H.S. | R.H.S. |
| $2$ | $4 \times 2 = 8$ | $28$ |
| $4$ | $4 \times 4 = 16$ | $28$ |
| $5$ | $4 \times 5 = 20$ | $28$ |
| $6$ | $4 \times 6 = 24$ | $28$ |
| $7$ | $4 \times 7 = 28$ | $28$ |
we have $L.H.S. = R.H.S$
So $x = 7$ is the solution of the given equation.
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