Here’s one way to do it, factor the square root of 28, completely and then go on from there.

Another method is a bit less work,

You could place both under the same radical sign, simplify, then solve

Here’s one way to do it, factor the square root of 28, completely and then go on from there.

Another method is a bit less work,

You could place both under the same radical sign, simplify, then solve

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