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 6x and 10x are two cross rectangles and the corner is 15, what can be the outer dimensions of the rectangle?

Answer and explanation

Correct answer: (2x + 3) and (2x + 5)

Answer: B, (2x + 3)(2x + 5). A rectangle model for a product has an x-by-x part, two cross parts, and a constant corner. Multiplying the two proposed dimensions gives (2x + 3)(2x + 5) = 4x² + 10x + 6x + 15 = 4x² + 16x + 15. The two cross rectangles are therefore 10x and 6x, and their corner is 3×5 = 15, exactly as required. Option A has cross terms 6x and 15x, although its corner is 15. Option C has a different structure and expands to 6x² + 100x + 150, so it does not match. Option D gives x² + 16x + 60, with corner 60 rather than 15. Common confusion: the two cross terms come from opposite pairings, so each must be checked separately; checking only the constant corner is insufficient.

Related tags

Cross-RectanglesDimension-CheckVisual-ModelAlgebraic-ExpansionVisual 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.