[ A classmate was completing the square to solve 4x2 + 10x = 8. For her first step she wrote 4x2 + 10x + 25 = 8 + 25. What was her error? ] guys please, theres 50 points for this and i really need help. im begging you.

Here's link to the

https://cutt.ly/kzjInUL

I think she forgot to square

Step-by-step explanation:

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m