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If (a=2) and (b=-4), what is the value of (ab+3a)?
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Answer and explanation
Correct answer: -2
Given \(a=2\) and \(b=-4\), \(ab+3a=(2)(-4)+3(2)=-8+6=-2\). Therefore, option A is correct. The value \(-14\) may result from incorrectly treating \(3a\) as \(-6\). Exam tip: after substitution, check the signs carefully while multiplying and adding negative numbers.
Frequently asked questions
What is the correct answer to this question?
-2
Why is this the correct answer?
Given \(a=2\) and \(b=-4\), \(ab+3a=(2)(-4)+3(2)=-8+6=-2\). Therefore, option A is correct. The value \(-14\) may result from incorrectly treating \(3a\) as \(-6\). Exam tip: after substitution, check the signs carefully while multiplying and adding negative numbers.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Algebraic expressions.
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