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B. - 15i - 59j +64k
C. 7x +8y +26z
(13a-8b) + (21a+9b) =13a-8b+21a+9b
=13a+21a-8b+9b
=34a+1b
Ini yg B
(15i-14j+13k) + (-30i-45j+51k)
=15i-14j+13k+(-30i)-45j+51k
=15i-30i-14j-45j+13k+ 51k
=-15i-59j+64k
Ini yg (c)
(3x-17y+35z) + (4x+23y-9z) =....
=3x-17y+35z+4x+23y- 35z
=3x+4x-17y+23y+35z- 9z
=7x-8y+26z