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= -a² +8a² +5ab -7ab
= 7a² -2ab
2. Dibalik dahulu, sehingga :
a² +3c +2 -(4a² +7c -7)
= a² +3c +2 -4a² -7c +7
= a² -4a² +3c -7c +2 +7
= -3a² -4c +9
3. 3a(2b -7) -2b(a -8b)
= 6ab -21a -2ab +16b²
= 6ab -2ab -21a +16b²
= 4ab -21a +16b²
Itu jawabannya.