Simplify (x+2y)(x-2y)

x² - 4y²

Step-by-step explanation:

Step 1

On expansion,

(x + 2y)(x - 2y) = x(x - 2y) + 2y( x - 2y)

= x(x) - x(2y) + 2y(x) + 2y(-2y)

= x² - 2xy + 2xy - 4y²

= x²- 4y²

Each of the terms are perfect squares

x² = x X x

4y² = (2y)² = 2y X 2y

Hence, x² - 4y² is the difference of two squares.

Simplification of (x+2y)(x-2y) gives x²-4y² which is the difference of two squares

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a