Juan's work for solving by completing the square is below. In which step (If any) does Juan make a mistake? 12x + 8 = 0
1. ? - 12 = -8
2. ? - 120 + 36 = -8 +36
3. (x-6)= 28
4. 2-6 = 1728
5. 2 - 6 = 127
6. x = 6+277
Plz help me

Step-by-step explanation:

If they are travelling in opposite directions, their total distance is the 135.  So add their distances together to get 135

x=Quinn's speed

x+5 = James' speed

they each travel for 5 hours

speed x time = distance

x(5) + (x+5)(5) = 135

Quinn's distance + James' distance = total distance

5x+5x+25=135

10x = 110

x = 11

Quinn travels at 11 mph and James travels at 16 mph

Quinn travels 55 miles (5x11)

and James travels 80 miles (16 x 5)

80 + 55=135