You have to make a proportion:
12+x/8=8/x
Then cross multiply to solve for x
Answer:
4
Step-by-step explanation:
52+6×2− 2
10
2 Simplify
6
×
2
6×2 to
12
12.
52
+
12
−
10
2
52+12−
2
10
3 Simplify
10
2
2
10
to
5
5.
52
+
12
−
5
52+12−5
4 Simplify
52
+
12
52+12 to
64
64.
64
−
5
64−5
5 Simplify.
59
59
Answer:
Step-by-step explanation:
(1) 
First, let's expand the expression:


Next, let's factor the quadratic:

Finally, set the equation equal to
to find the solutions


(2) During the step
, when you take the square root of both sides, you have two equations, rather than one:
and
, so the solutions should be 
(3)

Add
to both sides

Multiply both sides by 

Take the square root of both sides
±
Subtract
from both sides
