We can use quadratic formula to determine the roots of the given quadratic equation.
The quadratic formula is:

b = coefficient of x term = -11
a = coefficient of squared term = 2
c = constant term = 15
Using the values, we get:
So, the correct answer to this question are option B and D
Answer:

Step-by-step explanation:
We know that the vertex(lowest point) of
is
.
By inspection, we can see that the vertex of the graph is
.
So, the lowest point of
is
, which means 
Answer:
Assume that the formula is true for the (k+1)term
Step-by-step explanation:
I learned this in class a couple weeks ago in intermediate algebra
Domain of 5x^2 + 2x - 1 is all real numbers.
Well in my calculations I got: well if you he increases the speed by 2.6 per hour soo 4+2.6=6.6