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What is the value of (x^2-5x+6) when (x=2)?

Answer and explanation

Correct answer: (0)

The direct answer is option A, 0. Substitute x=2 carefully: x²−5x+6=2²−5(2)+6. First calculate the power, 2²=4. Then calculate the multiplication, 5(2)=10. The expression becomes 4−10+6. Now 4−10=−6, and −6+6=0. Option A is correct. Option B, 2, may result from an arithmetic or substitution mistake. Option C, 4, is only the value of x² and ignores the other terms. Option D, 6, is only the constant term and ignores the variable terms. The order of operations is important: powers first, multiplication next, and addition or subtraction from left to right. A useful check is that x²−5x+6=(x−2)(x−3), so x=2 makes one factor zero and the whole expression zero.

Related tags

Quadratic ExpressionsEvaluationSubstitution

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