SOLUTION: what is the simplify radical of 686

Question 570944: what is the simplify radical of 686
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given expression

The goal of simplifying expressions with square roots is to factor the radicand into a product of two numbers. One of these two numbers must be a perfect square. When you take the square root of this perfect square, you will get a rational number.

So let's list the factors of 686

Factors:
1, 2, 7, 14, 49, 98, 343, 686

Notice how 49 is the largest perfect square, so lets factor 686 into 49*14

Factor 686 into 49*14

Break up the square roots using the identity

Take the square root of the perfect square 49 to get 7

So the expression simplifies to

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Check:
Notice if we evaluate the square root of 686 with a calculator we get

and if we evaluate we get

This shows that . So this verifies our answer
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