![\bf \textit{recall that }i^2=-1 \\\\[-0.35em] ~\dotfill\\\\ x^2+25\implies x^2+5^2\implies x^2-(-5^2)\implies x^2-(-1\cdot 5^2)\implies x^2-(i^2\cdot 5^2) \\\\\\ \stackrel{\textit{difference of squares}}{x^2-(5i)^2}\implies (x-5i)(x+5i)](/tpl/images/0016/6345/71e6c.png)
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![[\because a^mb^m=(ab)^m]](/tpl/images/0016/6345/d6265.png)
![[\because a^2-b^2=(a-b)(a+b)]](/tpl/images/0016/6345/192da.png)
Which of the following expressions is equal to x^2+25
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