If (t=3), what is the value of (2t^2-t)?
Answer and explanation
Correct answer: 15
Substituting t=3 gives 2t^2-t=2(3^2)-3=2(9)-3=18-3=15. Therefore, the correct answer is 15. The nearby distractor 18 results from forgetting to subtract 3 in the final step. Exam tip: after substitution, evaluate powers first, then multiplication, and finally addition or subtraction.
Frequently asked questions
What is the correct answer to this question?
15
Why is this the correct answer?
Substituting t=3 gives 2t^2-t=2(3^2)-3=2(9)-3=18-3=15. Therefore, the correct answer is 15. The nearby distractor 18 results from forgetting to subtract 3 in the final step. Exam tip: after substitution, evaluate powers first, then multiplication, and finally addition or subtraction.
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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