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If \(x=4\), what is the value of \(x^3-3x^2+2x\)?
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Answer and explanation
Correct answer: 24
Substituting \(x=4\) gives \(x^3-3x^2+2x=4^3-3(4^2)+2(4)=64-48+8=24\). Therefore, 24 is correct. The value 22 results from an arithmetic error. In the exam, calculate powers first, then multiplication, followed by addition or subtraction.
Frequently asked questions
What is the correct answer to this question?
24
Why is this the correct answer?
Substituting \(x=4\) gives \(x^3-3x^2+2x=4^3-3(4^2)+2(4)=64-48+8=24\). Therefore, 24 is correct. The value 22 results from an arithmetic error. In the exam, calculate powers first, then multiplication, followed by addition or subtraction.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Polynomials. Topic: Operations on real numbers and the laws of exponents.
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