Given:
The given problem is:
[tex](x+3)^2\ne x^2+9[/tex]
Using the identity:
[tex](a+b)^2=a^2+b^2+2ab[/tex]
Now substitute a = x and b = 3 in this identity:
[tex]\begin{gathered} (x+3)^2=x^2+3^2+2\times x\times3 \\ =x^2+9+6x \end{gathered}[/tex]
Hence , the correct solution to the problem is:
[tex](x+3)^2=x^2+6x+9[/tex]
