Question

The total length of the fence around a quadrilateral-shaped garden shown is 3 a 2+ 15a + 9. What expression represents the missing fence length?

Help me asap!!!

Answer 1

the missing fence length = 2a² + 18

Explanation:

3a²+15a+9 = (a²-7) + (10a-2) + 5a + ? = a² + 15a -9

? = (3a²+15a+9) - (a² + 15a -9) = 2a² + 18