Question

 

Phân tích:

(a^2+9)^2-36a^2

 

Answer 1

\(\left(a^2+9-6a\right)\left(a^2+9+6a\right)\)

\(=\left(a-3\right)^2\left(a+3\right)^2\)

neu co sai bn thong cam

Answer 2

Ta có: (a^2 +9)^2 -36a^2

        =(a^2 +9)^2 -(6a)^2

        =(a^2 -6a +9)(a^2 + 6a +9) 

        =(a-3)^2 (a+3)^2

Answer 3

\(\left(a^2+9\right)^2-36a^2\)

\(=\left(x^2+9-6a\right)\left(x^2+9+6a\right)\)

\(=\left(x-3\right)^2.\left(x+3\right)^2\)