Answer:

Step-by-step explanation:
We have the following equations:


If we want to add these equations, we just need to add x-terms, y-terms and independent terms.


I hope it helps you!
In order to get rid of the fractions, you need to multiply the equation by 12
Let's rewrite the binomial as:


Using the binomial expansion, we get:

For the 15th term, we want the term where r is equal to 14, because of the fact that the first term starts when r = 0. Thus, for the 15th term, we need to include the 0th or the first term of the binomial expansion.
Thus, the fifteenth term is:
Answer:
There are two real and different roots
Step-by-step explanation:
The discriminant is given by b²-4ac
(-12)²-4(70×1)
144-280
136
Now 136>0