A: what are the solutions to the quadratic equation x^2+9=0?
b: what is the factored form of the quadratic expression x^2+9?
select one answer for question a, and select one answer for question b.
a: x=3
a: x=-3i
a: x=3i or x=-3i
a: x=3 or x=-3
b: (x+3)(x+3)
b: (x-3i)(x-3i)
b: (x+3i)(x-3i)
b: (x+3)(x-3)

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