25x2+30x+9 25*9=225 15*15=225 15+15=30
25x2+15x+15x+9
[5*5xx 3*5x] [3*5x 3*3]
5x(5x+3)+3(5x+3)
(5x+3)(5x+3)
Answer: (5x+3)2
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4x3+12x2+3x+9
5x2-18x+9 = (5x-3)(x-3)
15v2+52v+45 = (5v+9)(3v+5) when factord
That is 27 x 9 = 243
189