Answer
5$x^{2}$ + 2$y^{2}$
Work Step by Step
( 5$x^{2}$ + 4 ) - ( -2$y^{2}$ + 4 )
5$x^{2}$ + 4 + 2$y^{2}$ - 4
5$x^{2}$ + 2 $y^{2}$ simplify
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