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viktelen [127]
3 years ago
9

Perform the operation indicated, then place the answer in the proper location on the grid. The perimeter of a triangle is 7a - 1

1b. If two of its sides are 2a + b and a - 9b, what is the third side?

Mathematics
1 answer:
vlada-n [284]3 years ago
3 0

Answer: 4 a - 3 b

Step-by-step explanation:

Since, the perimeter of the triangle = sum of all the three side of the triangle.

Here, two sides of the triangle are 2a + b and a - 9b,

And, the perimeter of the triangle = 7 a - 11

Let third side = x

Therefore, 2 a + b + a - 9 b + x = 7 a - 11 b

⇒ 3 a - 8 b + x = 7 a - 11 b

⇒ x = 7 a - 11 b - 3 a + 8 b

⇒ x = 4 a - 3 b  ( by operating like terms)

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