Respuesta :

fayemioluwatomisin

Answer:

Step-by-step explanation:

To subtract -7a^2+3a-9 from 5a^2-6-4

We have

5a^2-10--7a^2+3a-9

5a^2-10+7a^2+3a-9

Collect like terms

12a^2+3a-10-9

12a^2+3a-19

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