Question
Solve the following equations by trial and error method: $4x = 28$
✓
Answer
$4x = 28$ Here, $L.H.S. = 4x$ and $R.H.S. = 28$
Therefore, if $x = 7, L.H.S. = R.H.S.$
Hence, $x = 7$ is the solution to this equation.
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x
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L.H.S.
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R.H.S.
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Is L.H.S. = R.H.S.
|
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$1$
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$4 \times 1 = 4$
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$28$
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No
|
|
$2$
|
$4 \times 2 = 8$
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$28$
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No
|
|
$3$
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$4 \times 3 = 12$
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$28$
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No
|
|
$4$
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$4 \times 4 = 16$
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$28$
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No
|
|
$5$
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$4 \times 5 = 20$
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$28$
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No
|
|
$6$
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$4 \times 6 = 24$
|
$28$
|
No
|
|
$7$
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$4 \times 7 = 28$
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$28$
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Yes
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Hence, $x = 7$ is the solution to this equation.
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