Someone !
add and simplify to find the answer for #15 and #12.
provide answers are both not sure if number 12 is correct and explain why! ?

see explanation

Step-by-step explanation:

12

Since the denominators are like, add the numerators leaving the denominator

=

=

15

We require the denominators to be like before we can add.

factor x² - 4 as a difference of squares

x² - 4 = (x + 2)(x - 2)

Expressing as

+

multiply the numerator/denominator of the first fraction by (x - 2)

= +

Expand and simplify the numerators, leaving the denominator

=

=

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.