U can use counters or ur fingers or just model it out with objects
If the vertex is at the maximum point they dy/dx=0 at that point...
dA/dx=-2x+4
dB/dx=-2x+8
dC/dx=2x-4
dD/dx=2x-8
So both B and D have a zero velocity at x=4, but only B is equal to 3 when x=4
B. is the correct quadratic with the vertex at (4,3)
Move all the terms containing Ф to the left side ...
0 = 0
H0P3 It H3LPS :)
3. -3. 6. -9
10. 2 = AB 0. 15 =3A
10. -1. 21. -6
0.00008 written in scientific notation is 8x10^-5