Question

2. If x= -1 and y = 2, find the value of the followi
(1) (x+y)(x - y)​

Answer 1

Answer:

Putting value of x and y

(x+y)(x-y)

x² - y² [(a+b)(a-b) = a²-b²]

= (-1)² - (2)²

= 1 - 4

= -3

Answer 2

Answer:

-3

Given,

X=-1,y=2

then

(X+y) (x-y)

(-1+2) (-1-2)

(-1+2) (-1-2)

(1) (-3)

-3