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If a triangle has sides x +3, 2x +5 and the perimeter is 7x, what is the expression for the missing side

Sagot :

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Answer:

  4x -8

Step-by-step explanation:

The perimeter is the sum of the side lengths:

  P = a + b + c

  7x = (x +3) +(2x +5) +c . . . . fill in the given information

  7x = 3x +8 + c . . . . simplify

  4x -8 = c . . . . . . . . . subtract (3x+8) from both sides

The missing side is 4x-8.

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