Question

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

Answer 1

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

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