Question 85294
The perimeter of a triangle is found by adding the three sides. In this case it would be:
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{{{4 + (sqrt(5) - sqrt(3)) + (sqrt(5) + sqrt(3))}}}
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Notice that the two terms involving {{{sqrt(3)}}} have opposite signs. Therefore, they cancel
each other out and the problem reduces to:
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{{{4 + sqrt(5) + sqrt(5)}}}
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And the two radicals add together to give:
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{{{4 + 2*sqrt(5)}}}
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and that is the perimeter.
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Hope this helps you to understand the problem a little better.