Question

(-2)^-7= -1/128 or 1/28​

Answer 1

Step-by-step explanation:

Find the least common denominator or LCM of the two denominators:

LCM of 28 and 7 is 28

Next, find the equivalent fraction of both fractional numbers with denominator 28

For the 1st fraction, since 28 × 1 = 28,

1

28

=

1 × 1

28 × 1

=

1

28

Likewise, for the 2nd fraction, since 7 × 4 = 28,

2

7

=

2 × 4

7 × 4

=

8

28

Add the two like fractions:

1

28

+

8

28

=

1 + 8

28

=

9

28

So, 1/28 + 2/7 = 9/28