19. the two adjacent sides of a rectangle are 5x ^ 2 - 3y ^ 2 and x ^ 2 + 2xy find the perimeter.

Perimeter of rectangle =2(length + breadth) 

Perimeter =2(3x²-5y²+7x²-xy) 

Perimeter =2(10x² -5y²-xy) 

Perimeter =20x²-10y² -2xy

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