Question

2+07+43-85+6475-9888+77
​

Answer 1

Answer:

-3369

Step-by-step explanation:

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Answer 2

Answer:

We know that, numbers having 2, 3, 7 or 8 at units place are not perfect squares.

That is because:

1

2

=1

2

2

=4

3

2

=9

4

2

=16

5

2

=25

6

2

=36

7

2

=49

8

2

=64

9

2

=81

Also,

10

2

=100

100

2

=10000

Hence, any perfect square will end with 1, 4, 5, 6, 9 or even number of zeros.

All the given numbers end with either 2, 3, 7, 8 or with odd number of zeros.

Hence, the given numbers are not perfect squares.