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Question

The perimeter of a triangle is 15x223x+9 and two of its sides are 5x2+8x1 and 6x29x+4. Find the third side.

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Solution

The perimeter of triangle =15x223x+9

Length of one side =5x2+8x1

Length of other side =6x29x+4

Sum of the lengths of the two sides =(5x2+8x1)+(6x29x+4)=11x2x+3

∴ Length of the third side = Perimeter of the triangle Sum of the other two sides

=(15x223x+9)(11x2x+3)

=15x223x+911x2+x3

=4x222x+6


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