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The length of a rectangle is
\(0x+5
0\) cm and its breadth is
\(0x-2
0\) cm. A student writes its area as
\(0x^2+3
0\) sq cm. Which statement about the student's error is correct?

Answer and explanation

Correct answer: The student omitted the linear term; the correct area is \(x^2+3x-10\) sq cm.

For area, multiply the dimensions: \((x+5)(x-2)=x^2-2x+5x-10=x^2+3x-10\). The student omitted the \(3x\) term. Option C also changes terms incorrectly. Exam tip: use distributive multiplication term by term.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesDistributive PropertyArea ApplicationPolynomial MultiplicationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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