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9 a la puterea 2 + 30a+ 25=

Răspuns :

9a ² + 30 a + 25 = > (3a+5)²
verificare: (3a+5)²= (3a)²+2*3a*5+(5)²=> 9a²+30a+25 (A)
[tex]9a^2+30a+25 = 9a^2 +15a+15a+25 = 3a\cdot(3a+5) + 5\cdot(3a+5) = \\ = (3a+5)(3a+5) = \boxed{(3a+5)^2}[/tex]