takashimi07
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  • 10-08-2017
  • Mathematics
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The perimeter of a triangle is 7a-11b. If two of its sides are 2a+b and a-9b, what is the third side?

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Аноним Аноним
  • 10-08-2017
you subtract the  2 given sides from the perimeter so its

7a - 11b - (2a + b) - (a - 9b)    ( Note the 2 sides must be in parantheses)

= 7a - 11b - 2a - b - a + 9b 

adding like terms:-

= 4a - 3b
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