For this case we have that by definition, the area of a triangle is given by:
![A = \frac {b * h} {2}](https://tex.z-dn.net/?f=A%20%3D%20%5Cfrac%20%7Bb%20%2A%20h%7D%20%7B2%7D)
Where:
b: It is the base of the triangle
h: It is the height of the triangle
According to the statement data we have:
![b = 6 + 2h](https://tex.z-dn.net/?f=b%20%3D%206%20%2B%202h)
Substituting we have:
![88 = \frac {(6 + 2h) * h} {2}\\176 = 6h + 2h ^ 2\\2h ^ 2 + 6h-176 = 0](https://tex.z-dn.net/?f=88%20%3D%20%5Cfrac%20%7B%286%20%2B%202h%29%20%2A%20h%7D%20%7B2%7D%5C%5C176%20%3D%206h%20%2B%202h%20%5E%202%5C%5C2h%20%5E%202%20%2B%206h-176%20%3D%200)
We divide between 2 on both sides:
![h ^ 2 + 3h-88 = 0](https://tex.z-dn.net/?f=h%20%5E%202%20%2B%203h-88%20%3D%200)
We factor by looking for two numbers that, when multiplied, are obtained -88 and when added together, +3 is obtained.
These numbers are +11 and -8.
![(h + 11) (h-8) = 0](https://tex.z-dn.net/?f=%28h%20%2B%2011%29%20%28h-8%29%20%3D%200)
We have two roots:
![h = -11\\h = 8](https://tex.z-dn.net/?f=h%20%3D%20-11%5C%5Ch%20%3D%208)
We choose the positive value.
Thus, the base of the triangle is:![b = 6 + 2 (8) = 22](https://tex.z-dn.net/?f=b%20%3D%206%20%2B%202%20%288%29%20%3D%2022)
Answer:
The base of the triangle is 22 units.