Tentukan hasil pengurangan a.5x-9y dari 7x+15y b.5x-3y+7 dari 5y-3x-4 c.-x^2+6xy+3y^2 dari 5x^2-9xy-4y^2 ^2 artinya pangkat dua Tolong yaa
mbakning
A. (7x+15y)-(5x-9y) = 7x+15y-5x+9y=7x-5x+15y+9y=2x+24y b. 5y-3x-4-(5x-3y+7)= -3x+5y-4-5x+3y-7=-3x-5x+5y+3y-4-7= -8x+8y-11 c. 5x^2-9xy-4y^2-(-x^2+6xy+3y^2)= 5x^2-9xy-4y^2+x^2-6xy-3y^2= 5x^2+x^2-9xy-6xy-4y^2-3y^2= 6x^2-15xy-7y^2
b. 5y-3x-4-(5x-3y+7)= -3x+5y-4-5x+3y-7=-3x-5x+5y+3y-4-7= -8x+8y-11
c. 5x^2-9xy-4y^2-(-x^2+6xy+3y^2)= 5x^2-9xy-4y^2+x^2-6xy-3y^2=
5x^2+x^2-9xy-6xy-4y^2-3y^2=
6x^2-15xy-7y^2