Subtract 7√5 - 4√5.

Answer 1

To subtract like terms, such as the terms with the square roots of 5 in this problem, we can simply subtract their coefficients.

So, we have:

7√5 - 4√5 = (7 - 4)√5 = 3√5

Therefore, 7√5 - 4√5 = 3√5.