Find the first four nonzero terms in a power series expansion about x 0
​
for a general solution to the given differential equation with the given value for x 0
​
. 5x 2
y ′′
−4y ′
+4y=0;x 0
​
=2 y(x)=+⋯ (Type an expression in terms of a 0
​
and a 1
​
that includes all terms up to order 3.)