If x is equal to a square + b square, y is equal to a square -b square, compute xy

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Can someone me and explain..will award brainlest!