If x = 4 and y = 2 then 4(5+2) = 28
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( -12 x8 y8 ) / ( 3 x4 y2 ) = -4 x4 y6
(x+y)4 = (x2+2xy+y2)2 = x4+4x3y+6x2y2+4xy3+y4
sqrt(100x4y4) = sqrt(100)*sqrt(x4)*sqrt(y4) = 10*x2*y2
88 + 5y - y2 66 - 3y + y2 Subtract: 22 + 8y -2y2
X2 + y2 = 100 = r2 r = 10