Step-by-step explanation:
The quadratic formula is:

A, in this case, is -2.
B is 5
C is -11
x = 
x = 
x = 
x =
and 
We can break up the fraction to make it easier on our eyes
x = 
≈1.9843
x = 
This is a GEOMETRIC sequence as each number is being multiplied by 1/4
Answer:
y = -5
Step-by-step explanation:
-10(-1/2y + (-7/2)) + 7y = -25
Let's first of all expand the bracket to get;
5y + 35 + 7y = -25
12y + 35 = -25
12y = -25 - 35
12y = -60
y = -60/12
y = -5