Derivation of equation 4

This blog is very similar to the previous blog except in this we get an equation with V2 in it instead of V1
So we isolate V1 this time and get V1=-a(delta)t+V2---> let call this one :(
and here comes the substitution and simplification.
d=1/2(V1+V2)(delta)t
d=1/2(-a(delta)t+V2+V2)(delta)t
d=1/2(-a(delta)+2V2)(delta)t
d=V2(delta)t-1/2a(delta)t^2


this can also come from the graph as it basically shows the area of the large rectangle subtract the area of the triangle to get the area of the trapezoid.
If you think about it that way then you realize you stupid you can be. I know thats how i felt.