0 reads0 ratings0 helpful
If (x=2), what is the value of (x(x+5)-3(x-1))?
Advertisement
Answer and explanation
Correct answer: 11
Substituting x=2 gives 2(2+5)-3(2-1). Thus, 2×7-3×1=14-3=11, so the correct answer is 11. A value such as 13 may result from not subtracting the term 3(2-1) correctly. Exam tip: after substitution, evaluate brackets first, then multiplication and subtraction.
Frequently asked questions
What is the correct answer to this question?
11
Why is this the correct answer?
Substituting x=2 gives 2(2+5)-3(2-1). Thus, 2×7-3×1=14-3=11, so the correct answer is 11. A value such as 13 may result from not subtracting the term 3(2-1) correctly. Exam tip: after substitution, evaluate brackets first, then multiplication and subtraction.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Algebraic expressions.
Student feedback
Was this question useful?
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Difficulty
Easy0%
Medium0%
Hard0%
Was the explanation clear?
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
Advertisement