Question

Please solve it fast ​

Answer 1

Answer:

-6a^2+4a+3

Step-by-step explanation:

Perimeter means sum of all sides. In the question , two of it's sides are given and assume the third side as "x". Now add all the sides and make it equal to the given perimeter.

Answer 2

Answer:

(-6a^2-4a+3)

Step-by-step explanation:

P=a+b+c

7a^2-8a+9=(13a^2-4a+6)+x

x=(13a^2-4a+6)-(7a^2-8a+9)

x=(-6a^2-4a+3)