Write the sum as a product then simplify the product.

(-4)+(-4)+(-4)+(-4)

-4 x 4 = -16

To write the sum as a product, we can use the multiplication property of addition. Since we have the same number repeated four times, we can write it as a product by multiplying the number by 4.

Therefore, the sum (-4) + (-4) + (-4) + (-4) can be written as (-4) * 4.

To simplify the product, we can perform the multiplication:

(-4) * 4 = -16

So, the simplified product of (-4) + (-4) + (-4) + (-4) is -16.