ada yang tau gk yang nomer 2 cara nya gimana

2) a. (7x+15y)-(5x-9y)
= 7x+15y-5x+9y
=7x-5x+15y+9y
=2x+24y

b. (5y-3x-4)-(5x-3y+7)
= 5y-3x-4-5x+3y-7
=5y+3y-3x-5x-4-7
=8y-8x-11

c. (5x²-9xy-4y²)-(-x²+6xy+3y²)
=5x²-9xy-4y²+x²-6xy-3y²
=5x²+x²-9xy-6xy-4y²-3y²
=6x²-15xy-7y²

2.a 7x-15y - 5x-9y= 2x-6y

2.b 5y-3x-4 - 5x-3y+7= 2y-8-11

2.c 5x'-9xy-4y' - (-x')+6xy+3y'= 6x'-15xy-7y'


ket..
' = kuadrat