x2 + 9 = (x + 3i)(x - 3i)
The answer is based on a knowledge of imaginary and complex numbers where i2 = -1
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x2-6x+9 = (x-3)(x-3) when factorised.
x2 + 9 + 20 = x2 + 29, and can not be factored.I assume though that you mis-wrote your question, and what you in fact want to ask is how to factor x2 + 9x + 20.In that case, the answer is (x + 4)(x + 5).
(x - 7)(x - 9)
(X-9)2
(x - 3)(x - 3)