Answer: brand extension
Explanation: Brand extension refers to a marketing strategy which involves a well-known, developed and popular brand who has enjoyed continuous success in a particular market aims to delve into another area of the market or totally different product category using the same brand name.
In the scenario above, Colgate, a household name in toothpaste manufacturing decided to launch the Colgate kitchen entree which an entirely different market domain. The innovation strategy wasn't successful as it got consumers confused who saw them as developers iating from their original domain. Even though Colgate's intention was to use their existing popularity to extend their brand.