Let S x 3 , x 2 2x, x 2 2, 1 x , show that 3x 3 x 5 belong to S

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Let S = {x 3 , x 2 + 2x, x 2 + 2, 1-x} , show that 3x 3 + x + 5 belong

Let S = {x ³, x ² + 2x, x ²+ 2, 1-x} , show that 3x ³ + x + 5 belong to S

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