In your notebook, set up the following subtraction in a vertical format and select the correct answer. Take - 4 + 3a2 from 7a - a2. - 4 a2 - 7 a + 4 - 4 a2 + 7 a + 4 - 4 a2 - 7 a - 4 4 a2 + 7 a + 4

-4a^2+7a+4, a=2 or - 1/4

Step-by-step explanation:

Take - 4 + 3a2 from 7a - a2

It means 7a - a^2 - (-4+3a^2)

7a - a^2 + 4-3a^2

7a - a^2-3a^2+4

7a - 4a^2+4

-4a^2+7a+4

-4a^2+8a-a+4

-4a^2-a+8a+4

-a (4a+1) + 2 (4a+1)

(-a+2) (4a+1) = 0

-a+2=0 4a+1=0

-a=-2 4a=-1

-a/-1=-2/-1 a=-1/4

a=2 or - 1/4