I don't know which one you want but here
Exact form: x=9/10
OR
Decimal form
x=0.9
A residual is a measure of how well a line fits an individual data point. Testing the two other points can really help to see how well the line fits.
Hello!
You can multiply (x-12) and (x+4)
x * x = x^2
x * 4 = 4x
-12 * x = -12x
-12 * 4 = -48
Now we have
x^2 - 8x - 48 = 9
Subtract 9 from both sides
x^2 - 8x -57 = 0
Use the quadratic formula
This give use the answer of
x = 4 +

Hope this helps!