Simply the rational expression. state any restrictions on the variable. k2-k-2/k2-4k-5

We are given

Firstly, we will factor numerator and denominator

Restrictions:

we know that denominator can not be zero

so, we can set denominator =0

and solve for k to get restrictions

Simplification:

we can see that k+1 gets cancelled

so, we get

..........Answer

1/4 and 8/3 because:

the reciprocal if 4 is 1/4 because 4 is used as 4/1 and the opposite of that is 1/4. the opposite of 3/8 is 8/3 so that is the answer.

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answer: d.) the total number of protons and neutrons is 15

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