1) pengurangan 2y²-3y+15 dari 3y²+5y-10 2)perkalian (2y-3) (y+2) 3)2x+3y²+4xyz Jika: X=3 Y= -4 Z=2

1.)
[tex]1) (2y {}^{2} - 3y + 15) - 3y {}^{2} + 15y - 10 = - y {}^{2} + 12y + 5[/tex]

Dik : X=3 Y= -4 Z=2
Dit : 1) 3y²+5y-10 - (2y²-3y+15 ) =.....
2) (2y-3) (y+2) =.....
3) 2x+3y²+4xyz=.....
JB : 1) 3y²+5y-10 - {2y²-3y+15 }
= 3(-4)²+5(-4)-10 - {2(-4)²-3(-4)+15 }
= 3(16)-20-10 - {2(16)+12+15}
= 48-10 - {32+27}
= 38 - 59
= -21
2) (2y-3) (y+2)
= 2y³+4y-3y-6
= 2y³+y-6
= 2(-4)³+(-4)-6
= 2(-64)-4-6
= -128-10.
= -138
3) 2x+3y²+4xyz
= 2(3)+3(-4)²+4(3)(-4)(2)
= 6+3(16)+12(-8)
= 6+48-96
= 54-96
= -42