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 (a=\sqrt{18}-\sqrt{8}) then what is the simplified form of (a)?

Answer and explanation

Correct answer: \(\sqrt{2}\)

Write \(18=9\times2\) and \(8=4\times2\). Then \(\sqrt{18}=3\sqrt{2}\) and \(\sqrt{8}=2\sqrt{2}\). Hence, \(a=3\sqrt{2}-2\sqrt{2}=\sqrt{2}\). \(2\sqrt{2}\) is a close distractor because it is only the simplified form of \(\sqrt{8}\), not the difference of the two surds. Exam tip: first extract perfect-square factors from radicals, then combine like surds.

Related tags

Real NumbersSurdsRadical SimplificationSquare RootsNumber SystemsMathematicsClass 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.