Arrange each trinomial in descending order and then find their sum. 5 + x2 + 2x x + x2 – 1​

You distribute whats outside the parentheses to whats inside. (Second line) Then, you add like terms, which is on one side, -15+2 is -13(third line). Then you single out the variable keeping it on one side by ,simply, subtracting 3x from 15x which is 12x(fourth line). Then you subtract 10 from -13 which is doing the opposite to get the variable by itself, that equals to -23. And, if you can have a decimal, then it comes to -23/12

Step-by-step explanation:

5(3x+2) = 3(x-5)+2

15x+10 = 3x-15+2

15x+10 = 3x-13

12x+10= -13

12x = -23

-23/12