100 POINTS PLEASE SHOW STEPS TO ALL PARTS Use the function f(x) to answer the questions:

f(x) = 4x2 − 7x − 15

Part A: What are the x-intercepts of the graph of f(x)? Show your work. (2 points)

Part B: Is the vertex of the graph of f(x) going to be a maximum or a minimum? What are the coordinates of the vertex? Justify your answers and show your work. (3 points)

Part C: What are the steps you would use to graph f(x)? Justify that you can use the answers obtained in Part A and Part B to draw the graph. (5 points)

Step-by-step explanation:

Part A: the x-intercepts are -3/2 and 5/2

2x + 3 = 0 --------> 2x = -3 ----------> x =

2x - 5 = 0 ---------> 2x = 5 -----------> x =

Part B: the parabola is a minimum, the vertex is (7/8,-289/16)

f(x)=ax^2+bx+c

if a>0, then the parabola opens up and the vertex is a minimum

a<0 then the parabola opens down and the vertex is a max

the x value of  the vertex in f(x)=ax^2+bx+c= is -b/(2a)

the y value of the vertex is f(-b/(2a))  

f(x) = 4 - 7x - 15

a = 4

b = -7

-b/2a=-(7)/(2*4)=7/8

f(7/8) = 4 - 7(7/8) - 15

f(7/8) = 49/16 - 49/8 - 15

f(7/8) = -289/16

Part C:

depending on others is critical to survival. my source is apex!

step-by-step explanation:

12.5 feet

step-by-step explanation: