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Question
Verify by substitution that the root of 3 + 2x = 9 is x = 3.
Solution
\[3 + 2x = 9\]
Substituting x = 3 in the given equation:
\[L . H . S . \hspace{0.167em} : \]
\[3 + 2 \times 3\]
\[\text{or}, 3 + 6 = 9 = R . H . S . \]
\[L . H . S . = R . H . S . \]
Hence, x = 3 is the root of the given equation.
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