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Question

Solve : 4x=28 by the trial-and-error method.

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Solution

From above 4x=28

At x=1, LHS=4×1=428

At x=2, LHS=4×2=828

At x=3, LHS=4×3=1228

At x=4, LHS=4×4=1628

At x=5, LHS=4×5=2028

At x=6, LHS=4×6=2428

At x=7, LHS=4×7=28=28

x=7 is the root of the equation

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