Answer:
Step-by-step explanation:
Given triangle is a right angle triangle
To find out x we use Pythagorean theorem
where c is the hypotenuse
c=square root (20),
Plug in the values in the formula
Subtract 20 on both sides
Divide whole equation by 2
0=x^2-2x-8
factor the right hand side
Set each factor =0 and solve for x
so
so
The length x cannot be negative, so