I will write the x right over here and we multiply x times this entire thing x times, x square is x to the third, x times, negative x is negative x squared, x times one is , positive x and now we want to subtract this whole expression from that whole expression and thats the same thing as adding the opposite or multiplying each of these terms by negative one and adding into these terms so lets do that so we have negative x to the third, negative one times negative x squared is positive x squared 