Question

OFFERING 75 POINTS!

Answer 1

Increase the to y-values of their directrixes, and the equations are

y = 2*x^2 + 15x + 18

y = -2*x^2 + 4x + 8

y = -x^2 + 3x + 8

Hope it helps.

Answer 2

With the form f(x+a) the vertex of the parabola will be shifted to left with a>0 and to the right with a<0. The larger the magnitude of a the more shift. So we can simply sort by the value a in descending order:

f(x+3)-->f(x+2)-->f(x)-->f(x-1/2)-->f(x-4)-->f(x-7)