SOLUTION: Multiply: (2-7i)^2 How do I express in simplified form. Assuming that all variables represent positive numbers: what is the square root of 396x^8y^19 Write using radical nota

Algebra ->  Exponents -> SOLUTION: Multiply: (2-7i)^2 How do I express in simplified form. Assuming that all variables represent positive numbers: what is the square root of 396x^8y^19 Write using radical nota      Log On


   



Question 658799: Multiply: (2-7i)^2
How do I express in simplified form. Assuming that all variables represent positive numbers: what is the square root of 396x^8y^19
Write using radical notation: (8x^3)^-1/3
How do I work these problems out? Thanks

Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
1) %282-7i%29%5E2
%282-7i%29%282-7i%29+=+4+-+14i+-+14i+%2B+49i%5E2
4+-+28i+%2B+49i%5E2 knowing i=sqrt%28-1%29, then i%5E2+=+sqrt%28-1%29%5E2+=+-1
4+-+28i+%2B+49%28-1%29+=+4+-+28i+-+49+=+highlight_green%28-45+-+28i%29
...
2)
highlight_green%286x%5E4y%5E9sqrt%2811y%29%29
...
3)
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