Question

Write in standard form. (3y-5)(3y+5)

Answer 1

(3y-5)(3y+5)

Let's start with the formulae

(a+b) (a-b) = a^2-b^2

Let insert it into the equation, we have

(3y-5)(3y+5)= (3y) ^2-(5)^2

3y(3y) -5(5)

9y^2-25. Ans