The product of two integers of opposite signs equal to the additive inverse of the product of their absolute values. This, to find the product of a positive and a negative integer we find the product of their absolute values and assign minus sign to the product.
You have the following equation:
|n| = 8 the two vertical bras | | means absolute value of variable n
when you have an equation with an absolute value you consider that n could be negative or positive, because the absolute value of a number always results in a positive number. Then, n can be 8 or -8, because |-8| = |8| = 8. Hence, you have
n = ±8
Yo sup??
For our convenience let h=x+1
therefore
when x tends to -1, h tends to 0
hence we can rewrite it as

This inequality is of the form 1∞
We will now apply the formula

plugging in the values of g(x) and f(x)

express coth² as cosh²/sinh² and also write cosh-1 as 2sin²(h/2)
(by applying the property that cos2x=1-sin²x)
After this multiply the numerator and denominator with h² so that we can apply the property that

Now your equation will look like this.

We will now apply the result

where x=h²
we get

we now multiply the numerator and denominator with 4 so that we can say



Apply the limits and you will get


Hope this helps.
- The answer is simply ( 1, 3 ) and ( 4, 0 ), Nishishi~
<em>- Ouma</em>