tolong dijawab dengan benar

NO 4.
A.
[tex]=(5a+8)+(8a+3)\\ =5a+8+8a+3\\ =13a+11[/tex]
B.
[tex]=(6p-5q-2r)+(-8p+6q+9r)\\ =6p-5q-2r-8p+6q+9r\\ =-2p+q+7r\\ =q+7r-2p[/tex]
C.
[tex]=(8{ x }^{ 2 }+4x-21)+(6{ x }^{ 2 }-14x+7)\\ =8{ x }^{ 2 }+4x-2+6{ x }^{ 2 }-14x+7\\ =14{ x }^{ 2 }-10x+5[/tex]
NO. 5.
A.
[tex]=(9a+12)-(7a+14)\\ =9a+12-7a-14\\ =2a-2\\ =2(a-1)[/tex]
B.
[tex]=(11{ x }^{ 2 }-17x+24)-({ 2x }^{ 2 }+15x-18)\\ =11{ x }^{ 2 }-17x+24-{ 2x }^{ 2 }-15x+18\\ =9{ x }^{ 2 }-32x+42[/tex]
C.
[tex]=4({ 7y }^{ 2 }+6y-5)-(-5)({ 4y }^{ 2 }-2y+8)\\ =28{ y }^{ 2 }+24y-5+5({ 4y }^{ 2 }-2y+8)\\ =28{ y }^{ 2 }+24y-5+20{ y }^{ 2 }-10y+40\\ =48{ y }^{ 2 }+14y+35[/tex]