Simplify 4a^2-12a^2-3a+8+9a^2-1-9a+8a

$4 a^{2} - 12 a^{2} - 3 a + 8 + 9 a^{2} - 1 - 9 a + 8 a$

Step 1

Subtract $12 a^{2}$ from $4 a^{2}$ .

$- 8 a^{2} - 3 a + 8 + 9 a^{2} - 1 - 9 a + 8 a$

Step 2

Add $- 8 a^{2}$ and $9 a^{2}$ .

$a^{2} - 3 a + 8 - 1 - 9 a + 8 a$

Step 3

Subtract $9 a$ from $- 3 a$ .

$a^{2} - 12 a + 8 - 1 + 8 a$

Step 4

Add $- 12 a$ and $8 a$ .

$a^{2} - 4 a + 8 - 1$

Step 5

Subtract $1$ from $8$ .

$a^{2} - 4 a + 7$