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

In the rectangle model of (x−3)(x−7), what will the constant corner be like?

Answer and explanation

Correct answer: Positive 21

The direct answer is A: the constant corner is positive 21. In the rectangle model, the constant corner comes from multiplying the two constant side pieces, −3 and −7. Their product is (−3)(−7)=+21 because the product of two negative numbers is positive. Expanding the whole expression confirms this: (x−3)(x−7)=x²−7x−3x+21=x²−10x+21. B incorrectly keeps a negative sign after multiplying two negatives. C and D use 10x, which belongs to the combined x-terms, not to the constant corner. The constant corner contains no x because both factors used there are constants. Memory cue: same signs multiply to a positive result; different signs multiply to a negative result.

Related tags

Constant-TermSigned-FactorsRectangle-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.