Using the completing-the-square method, find the vertex of the function f(x) = 5x + 10x + 8 and indicate whether it is a minimum or a maximum and at what point. O Maximum at (1, 8)
O Minimum at (1, 8)
O Maximum at (-1, 3)
O Minimum at (-1, 3)

can i get the link to the assignment?

step-by-step explanation:

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)

b

step-by-step explanation:

i dont know

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.