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

Which is the best form to find ( 98^2 ) using an identity?

Answer and explanation

Correct answer: \((100-2)^2\)

Since \(98=100-2\), writing \(98^2=(100-2)^2\) is the most convenient form. Using \((a-b)^2=a^2-2ab+b^2\) with \(a=100\) and \(b=2\) makes the calculation quick. Although \((90+8)^2\) and \((50+48)^2\) also equal \(98^2\), they do not use the advantage of the nearby round number 100. Exam tip: express a number in terms of a nearby multiple of 10 or 100 when finding its square.

Related tags

Algebraic IdentitiesPerfect SquareBinomial SquareMental CalculationClass 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.