Okay, so first you set equal to 0:

Next simplify the equation so that the leading coefficient is positive:

Looking at the quadratic equation you can't easily simplify it, so plug it into the quadratic equation and simplify:

I noticed a couple mistakes in your work, so if you want me to I can explain them in the comments section :)
Answer:
Step-by-step explanation:
4
Answer:
This isnt much of an answer just something to help-
Try doing A(1 + B)^I
Answer:
x = 2
Step-by-step explanation:
First isolate the variable:
10x - 4 = 16
+4 +4
10x = 20
Then get x by itself:
10x = 20
x = 20/10
x = 10
Answer:
JUST DOING THIS FOR POINTS
Step-by-step explanation:
LOL