Question

`If x = 2 y = -2 find the value of:
a) x² + y²
b) x² + 2xy + y²
c) x² - y²`​

Answer 1

Answer:

a ) 8

b ) , c ) 0

Step-by-step explanation:

Given,

x = 2

y = - 2

a )

x² + y²

= 2² + ( - 2 )²

= 4 + 4

= 8

b )

x² + 2xy + y²

= x² + xy + xy + y²

= x ( x + y ) + y ( x + y )

= ( x + y ) ( x + y )

= ( x + y )²

= ( 2 + ( - 2 ) )²

= ( 2 - 2 )²

= 0²

= 0

c )

x² - y²

= 2² - ( - 2 )²

= 4 - 4

= 0

Answer 2

Answer:

a. x/2 +y/2

2/2 +(-2/2)

4-(-4) =8

b. x/2 + 2xy +y/2

2/2 +2(2) (-2) +(-2/2)

4+4(-4) -4

4-16-4

4-20 =16

c. x/2 -y/2

2/2-2/2

4+4=8

I HOPE IT HELP YOU