I really need help with these.

Solve the equation for x. (If there is one solution with a multiplicity of two, enter it in both answer boxes.)

a^2x^2 + 8ax + 16 = 0

i think there is a larger and smaller value

Find all values of k that ensure that the given equation has exactly one solution.

6x^2 + kx + 9 = 0

there is a smaller and larger value

A wire 370 in. long is cut into two pieces. One piece is formed into a square and the other into a circle. If the two figures have the same area, what are the lengths of the two pieces of wire?

No idea on this one =(