Answer:

Step-by-step explanation:
Given
x² + x
To complete the square
add ( half the coefficient of the x- term )² to x² + x
x² + 2(
)x + (
)² = x² + x + 
= (x +
)² ← perfect square
The other leg would be 22.5 inches so the second option
One way to solve:
960-12x=816
144=12x
12=x
Another way to solve
80-x=68
x=12
Dimension of an equilateral
Answer:
x-2
Step-by-step explanation: