Chapter P, Prerequisites - Section P.5 - Algebraic Expressions - P.5 Exercises - Page 35: 8

(a) yes (b) yes

(a) (x+5)(x-5)=x$^2$-5x+5x-25=x$^2$-25 Therefore, the answer is yes. (b) Yes, you will get two terms because the formula for the product of a sum and difference of terms results in A$^2$-B$^2$ which in this case is x$^2$-a$^2$