Simplify 3a-2a*4a+6a

$3 a - 2 a \cdot 4 a + 6 a$

Simplify each term.

Rewrite using the commutative property of multiplication.

$3 a - 2 \cdot 4 a \cdot a + 6 a$

Multiply $a$ by $a$ by adding the exponents.

Move $a$ .

$3 a - 2 \cdot 4 (a \cdot a) + 6 a$

Multiply $a$ by $a$ .

$3 a - 2 \cdot 4 a^{2} + 6 a$

Multiply $- 2$ by $4$ .

$3 a - 8 a^{2} + 6 a$

Add $3 a$ and $6 a$ .

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