To do as Kiteman advised you, this is your answer: -7(2a^{2}-4) is -14a^{2}+28

L

Its a style thing, but I don't like hanging minus signs, so I always write 28-14a^{2}

I'd prefer that too, but I was doing a "literal" there.

L

Orksecurity has it almost right. The =word you need to know is associativity. Here's a hint: a × (b + c) = a×b + a×c.

Thanks for the correction.

For this specific example, multiply each thing inside the brackets by each thing outside the brackets.

Beware of your signs.

Transitivity and commutivity. Think about how you might do it if a was a specific number but you weren't allowed to subtract 4 before doing the multiplication.

## Discussions

To do as

Kitemanadvised you, this is your answer:-7(2

a^{2}-4)is

-14

a^{2}+28L

Its a style thing, but I don't like hanging minus signs, so I always write

28-14

a^{2}I'd prefer that too, but I was doing a "literal" there.

L

Orksecurity has it almost right. The =word you need to know is

associativity. Here's a hint: a × (b + c) = a×b + a×c.Thanks for the correction.

For this specific example,multiply each thing inside the brackets by each thing outside the brackets.Beware of your signs.

Transitivity and commutivity. Think about how you might do it if a was a specific number but you weren't allowed to subtract 4 before doing the multiplication.