If, a + b = 8,ab + c + d = 23,ac + bd = 28, andcd = 12,find the values of a, b, c, and d.

There are four possible solutions

Step-by-step explanation:

I was unable to manipulate this system to develop solvable equations, so I made a table consisting of 7 rows with the following 5 columns:

Table 1

I used the valid solutions (rows 3 thru 5) to determine which combinations satisfied ab + cd = 28.

Table 2

* represent the valid solutions

1) is right

step-by-step explanation:

it is 10.6 according to my calculations