tolong dong bantuan nya soalnya besok harus dikumpulin . . dari no 3 yaa smpai bawah makasih sebelumnya

3) -2(2x" + 3x -4)
= -4x" -6x + 8
4) 6x -5y -2z + (-8x +6y +9z)
= 6x -5y -2z -8x +6y +9z
= 6x -8x -5y +6y -2z +9z
= -2x +y +7z
5) 5y -3x -4 -(5x -3y +7)
= 5y -3x -4 -5x +3y -7
= -3x -5x +5y +3y -4 -7
= -8x +8y -11
6)(2x -3) ( x +5)
= 2x" +10x -3x -15
= 2x" +7x -15
7)(2x +y)"'
= (2x +y) (2x +y) (2x +y)
= 4x" +2xy +2xy +y" (2x +y)
= 4x" +4xy +y" (2x +y)
= 8x"' +4x"y +8x"y +4xy" +2xy" +y"'
= 8x"' +12x"y +6xy" +y"
8)(3y"'x4y""): 6y""'
=12y"""' :6y""'
=2y"