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 the value of \( 58\times42 \) using ( (50+8)(50-8) )?

Answer and explanation

Correct answer: 2436

Here, \(58=50+8\) and \(42=50-8\). Using the identity \((a+b)(a-b)=a^2-b^2\), we get \((50+8)(50-8)=50^2-8^2=2500-64=2436\). Option 2500 is only \(50^2\); subtracting \(8^2\) is essential. Exam tip: when two numbers are equally distant from a common middle number, use the difference of squares identity.

Related tags

Algebraic IdentitiesDifference Of SquaresMental MultiplicationInteger ArithmeticClass 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.