(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)
a2+9a+20 = (a+4)(a+5) when factored
(x + 10)(x + 2)
5(4x + 9)
(3x + 5)(3x^2 + 4)
5(n2 + 2n + 4)
(x+6)(X+20)
x2 + x - 20 = (x + 5)(x - 4).
(y + 5)(y - 4)
5(3a - 5b + 4)
(3v - 4)(3v + 5)
(5x - 4)(x - 5)
(3x - 5)(x + 4)