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If (n=-1), what is the value of (4n^2+3n-2)?
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Answer and explanation
Correct answer: -1
Substituting n=-1 gives 4n^2+3n-2=4(-1)^2+3(-1)-2. Since (-1)^2=1, the value is 4(1)-3-2=4-3-2=-1. Getting 1 usually results from using the wrong sign for 3(-1). Exam tip: Always use brackets when squaring a negative number.
Frequently asked questions
What is the correct answer to this question?
-1
Why is this the correct answer?
Substituting n=-1 gives 4n^2+3n-2=4(-1)^2+3(-1)-2. Since (-1)^2=1, the value is 4(1)-3-2=4-3-2=-1. Getting 1 usually results from using the wrong sign for 3(-1). Exam tip: Always use brackets when squaring a negative number.
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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