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Find the perimeter of this quadrilateral

Find the perimeter of this quadrilateral-example-1
User Eugene M
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\bf (x^2-6)~~+~~(2x+5)~~+~~(x^2-3x)~~+~~(4x^2+2x) \\\\\\ 6x^2+4x-3x-6+5\implies 6x^2+x-1
User Technical Bard
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