3 squared multiplied by 1.625 squared and come up with the answer of 3.412
3 squared multiplied by 1.625 squared does not equal 3.412
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3 squared divided by 1.625 squared does give an answer close to 3.412, maybe you meant this?
If you did want to do 3 squared divided by 1.625 squared then this could be done by saying:
( (3)² / (1.625)² ) = (3 / 1.625 )²
You can then do the division which will give you:
(3 / 1.625 )² = (1.846)² (up to 3 decimal places)
So now:
(1.846)² = 1.846 × 1.846 = 3.4077