Question

Subtract -7a^2+3a-9−7a 2+3a−9minus, 7, a, squared, plus, 3, a, minus, 9 from 5a^2-6a-45a 2 −6a−4

Answer 1

`12a^2-9a+5`

Explanation:

We need to subtract

`-7a^2+3a-9`

from

`5a^2-6a-4`

So

`5a^2-6a-4-(-7a^2+3a-9)`

Opeining the bracket changes the signs

`=5a^2-6a-4+7a^2-3a+9`

Bringing all the like terms together

`=5a^2+7a^2-6a-3a-4+9`

`=12a^2-9a+5`

The result after performing the required operation is
`12a^2-9a+5`.