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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?

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The total length of the fence around a quadrilateralshaped garden shown is 3 a 2 15a 9 What expression represents the missing fence length Help me asap class=

Respuesta :

Answer:

the missing fence length = 2a² + 18

Step-by-step explanation:

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

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