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Subjects
Class 9MathematicsIntroduction to PolynomialsLinear growth and decayEasyLevel 38
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If (J(x)=25-2x), what is (J(4))?

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Answer and explanation

Correct answer: 17

Substitute 4 for x: J(4)=25-2(4)=25-8=17. Therefore, 17 is the correct option. The value 19 would result from an incorrect calculation of 2×4. Exam tip: When evaluating a function, put the given value in brackets and perform multiplication first.

Related tags

PolynomialsFunction EvaluationSubstitutionLinear ExpressionLinear Decay

Frequently asked questions

What is the correct answer to this question?

17

Why is this the correct answer?

Substitute 4 for x: J(4)=25-2(4)=25-8=17. Therefore, 17 is the correct option. The value 19 would result from an incorrect calculation of 2×4. Exam tip: When evaluating a function, put the given value in brackets and perform multiplication first.

Which subject and chapter does this question cover?

This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.

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