Question

EXERCISE 3 (A)
1. Using the prime factorisation method, find which of the following numbers are not perfect squares:
(i) 400
(ii) 768
(iii) 1296
(iv) 8000
(v) 9025
number 5​

Answer 1

Answer:

400= 2×2×5×5×2×2= 2×2×5=20 It is a perfect square as there is twice each number

768 = 2×2 ×2×2×2×2×2×2×3=2×2×2×2×3 it is not a perfect square

1296 =2×2×2×2×3×3×3×3=2×2×3×3=36 it is a perfect square

8000 it is not a perfect square as it has odd number of zeros

9025 = is a perfect square