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If (3x+2=17), what is the value of (x^2-1)?

Answer and explanation

Correct answer: 24

Given 3x+2=17, subtracting 2 from both sides gives 3x=15, so x=5. Hence, x^2-1=5^2-1=25-1=24. Option 25 is only the value of x^2; 1 still has to be subtracted. Exam tip: first find the value of the variable, then substitute it into the complete expression.

Related tags

Algebraic ExpressionsSubstitutionLinear EquationsPolynomial EvaluationMathematics Class 9Introduction To PolynomialsMathematicsClass 9 Mcq

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