1.(x+y)(x+y)= ????????????????? 2.(x-y)(x-y)=??????? Tlongbntu yah?

Pembahasan.

Gunakan model a^2 + 2ab + b^2

( x + y ) ( x + y ) = x^2 + 2xy + y^2

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

1).jwb=x(x+y)+y(x+y)
=x²+xy+xy+y²
=x²+2xy+y²
2).jwb=x(x-y)-y(x-y)
=x²-xy-xy+y²
=x²-2xy+y²