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✒ penjumlahan
(2x² + 5y - 4z) + (3x² - 7y - 10z)
= 2x² + 3x² + 5y - 7y - 4z -10z
= 5x² - 2y - 14z
✒ pengurangan
(2x² + 5y - 4z) - (3x² - 7y - 10z)
= 2x² + 5y - 4z - 3x² +7y + 10z
= -x² + 12y + 6z
B. 6xy - 7ab dan 12xy + 12ab
✒ penjumlahan
(6xy - 7ab) + (12xy + 12ab)
= 6xy + 12xy - 7ab + 12ab
= 18xy + 5ab
✒ pengurangan
(6xy - 7ab) - (12xy + 12ab)
= 6xy - 7ab - 12xy - 12ab
= -6xy - 19ab
C. 12xy + 15z dan -6xy - 4z
✒ penjumlahan
(12xy + 15z) + (- 6xy - 4z)
= 12xy - 6xy + 15z - 4z
= 6xy + 11z
✒ pengurangan
(12xy + 15z) - (- 6xy - 4z)
= 12xy + 15z + 6xy + 4z
= 18xy + 19z
Semoga membantu,,
Maaf kalau ada kesalahan.