Question

I need help on #5 Please help me on my hw

Answer 1

Given:

The given problem is:

$(x+3)^2\ne x^2+9$

Using the identity:

$(a+b)^2=a^2+b^2+2ab$

Now substitute a = x and b = 3 in this identity:

$\begin{gathered} (x+3)^2=x^2+3^2+2\times x\times3 \\ =x^2+9+6x \end{gathered}$

Hence , the correct solution to the problem is:

$(x+3)^2=x^2+6x+9$