Whakaoti i te 3a*ab-2a^2*(-4b)-8*(2a^2b)=

$$3 a \cdot a b - 2 a ^ { 2 } \cdot ( - 4 b ) - 8 \cdot ( 2 a ^ { 2 } b ) =$$

Aromātai

$$-5ba^{2}$$

Ngā Upane Otinga

Whakareatia te a ki te a, ka a^{2}.

$$3a^{2}b-2a^{2}\left(-4\right)b-8\times 2a^{2}b$$

Whakareatia te 2 ki te -4, ka -8.

$$3a^{2}b-\left(-8a^{2}b\right)-8\times 2a^{2}b$$

Ko te tauaro o -8a^{2}b ko 8a^{2}b.

$$3a^{2}b+8a^{2}b-8\times 2a^{2}b$$

Pahekotia te 3a^{2}b me 8a^{2}b, ka 11a^{2}b.

$$11a^{2}b-8\times 2a^{2}b$$

Whakareatia te 8 ki te 2, ka 16.

$$11a^{2}b-16a^{2}b$$

Pahekotia te 11a^{2}b me -16a^{2}b, ka -5a^{2}b.

$$-5a^{2}b$$

Kimi Pārōnaki e ai ki b

$$-5a^{2}$$