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 (10^k × 1000^2) / 100 = 10^9, what is the value of k?

Answer and explanation

Correct answer: 5

The governing concept is the laws of exponents after expressing all numerical factors with base 10. Since 1000=10³, its square is 1000²=(10³)²=10⁶. Also, 100=10². Therefore the left side becomes (10^k×10⁶)/10²=10^(k+6−2)=10^(k+4). The equation is then 10^(k+4)=10⁹. Equal powers of the same valid base 10 have equal exponents, so k+4=9 and k=5. Thus option C is correct. The alternatives can arise from forgetting the square on 1000, mishandling division by 100, or treating the final exponent 9 as the answer without accounting for the other factors. Substitution gives 10⁵×10⁶/10²=10⁹, confirming the result.

Related tags

ExponentsPowers-Of-TenAlgebraic-SimplificationOperations On Real Numbers And The Laws Of ExponentsPolynomialsMathematicsClass 10 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.