To find the side, take the square root of 441. Since 21 × 21 = 441, the side length of the square is 21 meters. So, the side is 21 m. Class 8 NCERT Ganita Prakash Chapter 1 A Square and ...
Category: Class 8 Maths
NCERT Solutions for Class 8 Maths all chapters updated for academic session 2020-2021.
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Use identity: a³ – b³ = (a–b)(a² + ab + b²), a² – b² = (a–b)(a + b). (i) has largest numbers and cube difference. So, 67³ – 66³ is the greatest. Class 8 Mathematics Ganita Prakash A Square and A ...
Yes: 1331 → 11³ 4913 → 17³ 12167 → 23³ 32768 → 32³ The cube roots are guessed by memorising cube tables or checking ending digits and nearby cube ranges. Class 8 Mathematics Textbook Chapter 1 A Square and A Cube ...
(i) False – cube of odd is odd. (ii) False – 2³ = 8. (iii) True – 5³ = 125. (iv) True – 99³ = 970299 (v) False – cube numbers (unless cube of square) have even factors. Class 8 Mathematics ...
Prime factorisation of 1323 = 3³ × 7². To make it a cube, we need one more 7. So, multiply by 7. 1323 × 7 = 9261 and 9261 = 21³. So, required number = 7. Class 8 Mathematics Textbook Chapter ...