Subtract 7√5−4√5

The difference is what?

1 answer

To subtract \(7\sqrt{5} - 4\sqrt{5}\), you can combine the like terms (which are both multiples of \(\sqrt{5}\)):

\[ 7\sqrt{5} - 4\sqrt{5} = (7 - 4)\sqrt{5} = 3\sqrt{5} \]

So, the difference is \(3\sqrt{5}\).