Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

Reena says that expanding \((x+4)(x-4)\) gives \(x^2+16\). Which expression correctly identifies and fixes her error?

Answer and explanation

Correct answer: \(x^2-16\)

This matches \((a+b)(a-b)=a^2-b^2\). Hence, \((x+4)(x-4)=x^2-4^2=x^2-16\). Reena used the wrong sign for the constant term. Exam tip: opposite binomials give a difference of squares.

Related tags

Algebraic IdentitiesQuadratic ExpressionsDifference Of SquaresError AnalysisClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.