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If x + y = 5 and xy = 3, then compute x^3 + y^3.

 Jul 10, 2020
 #1
avatar+28021 
+2

(x+y)^3 = ( x^3 + y^3)  + 3x^2y + 3xy^2

125      =  (x^3  + y^3)   + 3 (15 )                  (x+y)(xy) =   x^2 y + xy^2

 

80 = x3 + y3


 

 Jul 10, 2020
 #2
avatar+41 
+1

good job ep nice.

 Jul 10, 2020

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