Answer:
x = 0.58 or x = -8.58 to 2 d.p.
Step-by-step explanation:
Question: 
Just to write the question in a better format : 
 
 
Solve for x. 
Answer: 
First we Simplify this by dividing everything by 2:  
 ÷ 2 :
 ÷ 2 : 

Now we use the quadratic formula : 
 (side note: +/- is meant to be ±)
  (side note: +/- is meant to be ±) 
Now we substitute a with 1, b with +8 and c with -5: 
 
   
  
   
The surd  = 2
 = 2 So :
 So : 
x = -8± 2√21 /2
x = -4 ±√21 
This is our answer . Remember it is two answers in 1. 
x = -4 +√21 and x = -4 -√21 
x = 0.58257569495  or x = -8.58257569496 
x = 0.58 or x = -8.58 to 2 d.p.
Hope this helped and brainliest please