Hardy weinberg equ'm

In a population of 1000 plants, the frequency of the a allele is 5 percent. Suppose a fire causes the loss of 500 individuals who are homozygous for the A allele. In this case the fire caused the
frequency of a to change from ______ to ______.

so, the first one should be 0.05 (5%)

I am not sure how to calculate the second one.

a = 0.05
p + q = 1
p+ 0.05 = 1
p = 0.95

(0.95)^2= AA?

any hint ? thx

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