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If (x=3), what is the value of (2x+5)?

Answer and explanation

Correct answer: (11)

Direct answer: Option B is correct. To find the value of an algebraic expression, substitute the given value of the variable first and then follow the operations. Here, the variable is x and its value is 3. Replace x by 3: 2x+5 becomes 2(3)+5. Multiply before adding: 2(3)=6. Then add 5: 6+5=11. Thus the answer is 11, which is option B. Option A, 8, would result from an incorrect operation such as adding 3 and 5 while forgetting the coefficient 2. Option B is correct because it follows direct substitution and multiplication. Option C, 13, may come from adding incorrectly or using an unsupported operation; it is not the value of the expression. Option D, 15, is also obtained by an incorrect calculation and does not follow the stated expression. Exam cue: replace the letter, use brackets, multiply first, and add last.

Related tags

AlgebraEvaluationVariables

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