Question

19. The perimeter of a triangle is 7a2-8a+9 and two of its sides are 2a2-a+1 and 11a2-3a+5.
Find the third side of the triangle.​

Answer 1

Answer:

6a2+4a-3

Step-by-step explanation:

Let the number be 'x' then,

Perimeter of a triangle=sum of all sides or (a+a+a).

7a2-8a+9=(2a2-a+1)+(11a2-3a+5)+x

7a2-8a+9 =(13a4-4a+6)+x x=(13a4-4a+6)-(7a2-8a+9)

x=13a4-4a+6-7a2+8a-9

x=6a2+4a-3

Answer 2

Step-by-step explanation:

okay you are understand my answer