The error was made when he added the number in the radical expression in the computation, despite the fact that the numbers do not have the same base.
<h3>What are the radical expressions?</h3>
Any expression that contains a radical symbol is considered a radical expression. To find the square roots, cubic roots, and higher, radical symbols are used. For example, √7, √6, and √11 are in the radial form.
The expression is given in the question following:
4√5 + 7√3
11√8
The error was made in that he add the number in the radical expression in the calculation while the terms are not the same base.
Learn more about radical expressions here:
brainly.com/question/3796764
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