How to use theme function in post/page?

Whenever using any WordPress function with get_xyz_etc() make sure you ECHO the function if you want to output the value there:

<img class="first-slide" src="https://wordpress.stackexchange.com/questions/203434/<?php echo get_template_directory_uri() ."/images/landing-banner.png'; ?>" alt="First slide">

It will now output the path!

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