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Simplify the expression.
__ __ _
Ö63 - 2Ö28 + 5Ö7
The largest perfect square that will divide evenly
into 63 is 9, so we write 63 as 9·7
The largest perfect square that will divide evenly
into 28 is 4, so we write 28 as 4·7
___ ___ _
Ö9·7 - 2Ö4·7 + 5Ö7
Take individual square roots of factors under
the radical:
_ _ _ _ _
Ö9·Ö7 - 2Ö4·Ö7 + 5Ö7
_ _ _
3Ö7 - 2·2Ö7 + 5Ö7
_ _ _
3Ö7 - 4Ö7 + 5Ö7
_
4Ö7
Edwin
AnlytcPhil@aol.com
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