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

If the cut model of x² − b² is rearranged into a rectangle and one side is x − b, what is the other side?

Answer and explanation

Correct answer: x + b

The correct answer is C: x + b. The difference of squares identity is x² − b² = (x − b)(x + b). A cut-and-rearrange area model represents the same total area before and after rearrangement. If one side of the new rectangle is x − b, the remaining factor must be x + b so that the product equals x² − b². Multiplying verifies it: (x − b)(x + b) = x² + xb − xb − b² = x² − b². Option A would give (x − b)², which contains a −2xb term. Option B is the negative of the required factor and would reverse the sign of the area under ordinary positive lengths. Option D is not a factor and has the wrong degree. Memory cue: difference of squares always means difference times sum.

Related tags

Difference Of SquaresRearrangementRectangle ModelVisual Models Of IdentitiesExploring 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.