Which point represents the value of -1 1/2?

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

How is this equation completed? i cannot find any examples in the book.

Asa a yogurt shop allows its customers to add, for no charge, 3 toppings to any yogurt purchased. if the store has 18 possible toppings, how many different 3-topping combinations can a customers choose?