Question

2√5 - 7√5 is equal to
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Answer 1

2√5 - 7√5 is equal to

answer : -11.1

Answer 2

Given:

$2\sqrt{5} -7\sqrt{5}$

Here, radicals are like terms. So, we can add the numbers preceded the radicals.

$=(2-7)\sqrt{5}$

$=-5\sqrt{5}$.

Hence, $2\sqrt{5} -7\sqrt{5}$ is equal to $-5\sqrt{5}$.