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In which option is the difference of (4x+9) and (x-3) equal to (3x+12)?

Answer and explanation

Correct answer: \(4x+9-(x-3)\)

To find the difference, subtract the second expression from the first: \(4x+9-(x-3)=4x+9-x+3=3x+12\). Therefore, option A is correct. In option B, the order of subtraction is reversed, so it gives \(-3x-12\). Exam tip: When a bracket is preceded by a minus sign, change the signs of all terms inside it.

Related tags

PolynomialsLinear PolynomialsSubtraction Of PolynomialsAlgebraic ExpressionsSign RulesIntroduction To PolynomialsMathematicsClass 9 Mcq

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