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If (5x-3=22), what is the value of (x^2+2x)?

Answer and explanation

Correct answer: 35

Given \(5x-3=22\), add 3 to both sides to get \(5x=25\), so \(x=5\). Now substitute in the expression: \(x^2+2x=5^2+2(5)=25+10=35\). Hence, 35 is the correct answer. The value 30 may result from incorrectly evaluating \(x^2\). Exam tip: first find the value of the variable from the equation, then substitute it carefully into the expression.

Related tags

Algebraic ExpressionsSubstitutionLinear EquationsPolynomial EvaluationIntroduction To PolynomialsMathematicsClass 9 Mcq

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