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Question

In the algebraic equation 3x+25x=9+x3, the value of the unknown is

A
3
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B
4
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C
3
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Solution

The correct option is C 3
Given: 3x+25x=9+x3

Concept: For ease of solving an equation, the unknowns are brought to oneside and the constants are brought to the other side of the equation.

Place the unknowns in the Left hand side(LHS) and the constants in the Right hand side(RHS)
3x5xx3=92
2xx3=77x3=7
Divide the above algebraic equation by 7 on both sides
7x7×3=77
x3=1
Multiply the above algebraic equation by 3 on both sides
3×x3=3×1
x=3

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