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2 years ago

(06.02 MC)

Mathematics

1 answer:

mezya [45]2 years ago

8 0

Step-by-step explanation:

<h3>Given</h3>

Side 1: 3x² - 2x - 1
Side 2: 9x + 2x² - 3
Perimeter: 5x³ + 4x² - x - 3

Sum of side lengths 1 and 2

3x² - 2x - 1 + 9x + 2x² - 3 =
5x² + 7x - 4

The perimeter is the sum of all three sides.

The length of the third side is

P - (side 1 + side 2) =
5x³ + 4x² - x - 3 - (5x² + 7x - 4) =
5x³ + 4x² - x - 3 - 5x² - 7x + 4 =
5x³ - x² - 8x + 1

Part A - addition

Part B - subtraction

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