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

What is obtained after simplifying (4r(r-1)-3r(2-r))?

Answer and explanation

Correct answer: \(7r^2-10r\)

Apply the distributive property: \(4r(r-1)=4r^2-4r\). Also, \(-3r(2-r)=-6r+3r^2\), since \(-3r\times(-r)=+3r^2\). Combining like terms gives \(4r^2+3r^2-4r-6r=7r^2-10r\). Therefore, option A is correct. In option C, the linear terms have been combined incorrectly. Exam tip: when expanding an expression with a negative sign, check the sign of every product separately.

Related tags

Algebraic ExpressionsPolynomial SimplificationDistributive PropertyLike TermsQuadratic PolynomialIntroduction To PolynomialsMathematicsClass 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.