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If \(x = 2\), what is the value of \(x^2 + 5x - 6\)?

Answer and explanation

Correct answer: 8

The main idea is substitution: when a value of a variable is given, replace the variable with that value everywhere in the expression. Here, every x becomes 2. The expression therefore becomes a numerical calculation, not an expression with an unknown value. The order of operations is important because the square is evaluated before multiplication and addition or subtraction.

Substitute and calculate: \(x^2+5x-6=2^2+5(2)-6\). First, \(2^2=4\); next, \(5(2)=10\). Thus the result is \(4+10-6=8\). Therefore option A, 8, is correct. Option B would result from forgetting the subtraction, while the other choices do not follow from the substitution.

Related tags

SubstitutionQuadratic ExpressionOrder Of OperationsQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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