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If (y=4), what is the value of (y^2-1)?
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Answer and explanation
Correct answer: 15
Given y=4, substitute it into y²−1: 4²−1=16−1=15. Therefore, 15 is the correct answer. 16 is only the value of y²; 1 still has to be subtracted. Exam tip: after substitution, evaluate powers before addition or subtraction.
Frequently asked questions
What is the correct answer to this question?
15
Why is this the correct answer?
Given y=4, substitute it into y²−1: 4²−1=16−1=15. Therefore, 15 is the correct answer. 16 is only the value of y²; 1 still has to be subtracted. Exam tip: after substitution, evaluate powers before 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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