answer: -5 
work:
set up as fractions.

multiply across to solve.
so, multiply -2 x 8 and 1 x 3.
you get 
or, -5 
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Answer: It is a difference of two squares, and it factors to (3x-7)(3x+7)
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Explanation:
We can write the 9x^2 as (3x)^2 since
(3x)^2 = (3x)*(3x) = (3*3)*(x*x) = 9x^2
The 49 can be written as 7^2 because 7^2 = 7*7 = 49.
This means 9x^2 - 49 is the same as (3x)^2 - 7^2. We have a difference of two squares.
The difference of squares factoring rule is
a^2 - b^2 = (a-b)(a+b)
which we have a = 3x and b = 7 in this case
So,
a^2 - b^2 = (a-b)(a+b)
(3x)^2 - 7^2 = (3x-7)(3x+7)
9x^2 - 49 = (3x-7)(3x+7)
Side note: This is the same as (3x+7)(3x-7). We can multiply two numbers in any order.
Answer:
a) The GCF of 63 and 36 is 9
b)

Explanation:
a) To find the GCF of 63 and 36, we do the following:
Write 63 and 36 as follows:

The common factors are:

Therefore, the Greatest Common Factor (GCF) is 9
b) To find the factor 63 - 36
Answer:
4
Step-by-step explanation: