Oh, dude, the square root of -7 in radical form is just "i√7". It's like when you're looking for the square root of a negative number, you just throw in that imaginary "i" to keep things interesting. So, yeah, it's not your typical square root, but hey, math loves to keep us on our toes, right?
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The square root of 28 in simplified radical form is...2 * Square root of 7
The square root of 252 in simplified radical form is 2√63.
7
7√3
2√7