Question

plz help me its urgent ​

Answer 1

Step-by-step explanation:

given,

perimeter = 9a^2 - 8a + 7

side_1 = a^2 - a + 6

side_2 = 3a^2 - 2a - 5

let,

side_3 = x

sum of sides = perimeter

a^2 - a + 6 + 3a^2 - 2a - 5 + x = 9a^2 - 8a + 7

4a^2 - 3a + 1 + x = 9a^2 - 8a + 7

x = 9a^2 - 4a^2 - 8a + 3a + 7 - 1

x = 5a^2 - 5a + 6

therefore side_3 = 5a^2 - 5a + 6