9x2 - 28x + 20 = 9x2 - 18x - 10x + 20 = 9x(x - 2) - 10(x - 2)
= (9x - 10)*(x - 2)
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(3x + 5)(3x^2 + 4)
(5x - 4)(x - 5)
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).
4(x^2 + 2x - 5)
(5x - 4)(3x + 5)