The equivalent of the expression as shown in the question above is 3√7 .
What is surd?
The term surd refers to an irrational number. Usually surd forms appear as a square root.
In this case, we have to write each surd in its basic form as follows;
2√7 - 3√7 + 4√7. This will now give us;
2√7 - 3√7 + 4√7 = 3√7
Learn more about surd:https://brainly.com/question/24700530
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