Question

*MATHS*
CLASS 8
CHAPTER 6
'SQUARE AND SQUARE NUMBERS'
EXERCISE 6.3

4. Without doing any calculation, find the numbers which are
surely not perfect squares.
1)153
2)257
3)408
4)441

5. By repeated subtraction method, find whether the following numbers are perfect squares or not?
(i) 121
(ii) 36
(ii) 49
(iv) 55
(v) 90

Please give correct answers . I will mark BRAINLIEST.​

Answer 1

Step-by-step explanation:

Q5 90

Q4 257

bhai muje question no 4 me dought lag raha h

Answer 2

Answer:

4) numbers ending with 2,3,7,8 are never perfect square.... 153,257,408 are not perfect squares.....

5) n² is the sum of first n odd numbers.....(like 1+3=4 which is the square of 2, 1+3+5=9 which is the square of 3) using this property

121-1=120

120-3=117

117-5=112

112-7=105

105-9=96

96-11=85

85-13=72

72-15=57

57-17=40

40-19=21

21-21=0

hence 121 is a perfect square count the number of times we subtracted that will give you the square root of 121, which is 11.

use this property on other numbers yourself, I am too lazy to do it all.