SOLUTION: 188.) (7xy˛-10y)(7xy˛+10y)
221.) (xy+ab˛)(xy-ab˛)
simplify....thanks
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Question 175957: 188.) (7xy˛-10y)(7xy˛+10y)
221.) (xy+ab˛)(xy-ab˛)
simplify....thanks
Found 2 solutions by stanbon, checkley75:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
These both follow the pattern (a-b)(a+b) = a^2-b^2
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(7xy˛-10y)(7xy˛+10y) = (7xy^2)^2 - (10y)^2 = 49x^2y^4 - 100y^2
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221.) (xy+ab˛)(xy-ab˛)
= (xy)^2 - (ab^2)^2 = x^2y^2 - a^2b^4
=========================================
Cheers,
Stan H.
Answer by checkley75(3666) (Show Source): You can put this solution on YOUR website!
188.)
7xy˛-10y
7xy˛+10y
-------------
49x^2y^4-100y^2 ans.
221.)
xy+ab˛
xy-ab˛
-----------
x^2y^2-a^2b^4 ans.
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