Question

(y-3)^2 - (y+5)^2 factorise the following

Answer 1

Step-by-step explanation:

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

Let (y-3)^3 = a

and (y+5)^2 = b

apply this formula

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

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

= (2y+2) (2)

= 4y +4 = 0

= 4y =0-4

= 4y = -4

= y = -4÷ 4

= y = -1