Question

Find the product of (y-4) (y+4) by using a suitable identity

Answer 1

(y-4)(y+4)
y square – 4 square
y square – 16

Answer 2

(y-4)(y+4)

Using the Formula (a+b)(a-b)= a^2 - b^2

Putting a=-4 b=4

=(y)^2 - (4)^2

=(y^2 - 16

This is the answer