Whakaoti i te -7x(x-3)-(4-3x)(2x-2)

$$-7x(x-3)-(4-3x)(2x-2)$$

Aromātai

$$-\left(x-8\right)\left(x+1\right)$$

Ngā Upane Otinga

Whakamahia te āhuatanga tohatoha hei whakarea te -7x ki te x-3.

$$-7x^{2}+21x-\left(4-3x\right)\left(2x-2\right)$$

Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 4-3x ki ia tau o 2x-2.

$$-7x^{2}+21x-\left(8x-8-6x^{2}+6x\right)$$

Pahekotia te 8x me 6x, ka 14x.

$$-7x^{2}+21x-\left(14x-8-6x^{2}\right)$$

Hei kimi i te tauaro o 14x-8-6x^{2}, kimihia te tauaro o ia taurangi.

$$-7x^{2}+21x-14x-\left(-8\right)-\left(-6x^{2}\right)$$

Ko te tauaro o -8 ko 8.

$$-7x^{2}+21x-14x+8-\left(-6x^{2}\right)$$

Ko te tauaro o -6x^{2} ko 6x^{2}.

$$-7x^{2}+21x-14x+8+6x^{2}$$

Pahekotia te 21x me -14x, ka 7x.

$$-7x^{2}+7x+8+6x^{2}$$

Pahekotia te -7x^{2} me 6x^{2}, ka -x^{2}.

$$-x^{2}+7x+8$$

Whakaroha

$$8+7x-x^{2}$$

Ngā Upane Otinga

Whakamahia te āhuatanga tohatoha hei whakarea te -7x ki te x-3.

$$-7x^{2}+21x-\left(4-3x\right)\left(2x-2\right)$$

Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 4-3x ki ia tau o 2x-2.

$$-7x^{2}+21x-\left(8x-8-6x^{2}+6x\right)$$

Pahekotia te 8x me 6x, ka 14x.

$$-7x^{2}+21x-\left(14x-8-6x^{2}\right)$$

Hei kimi i te tauaro o 14x-8-6x^{2}, kimihia te tauaro o ia taurangi.

$$-7x^{2}+21x-14x-\left(-8\right)-\left(-6x^{2}\right)$$

Ko te tauaro o -8 ko 8.

$$-7x^{2}+21x-14x+8-\left(-6x^{2}\right)$$

Ko te tauaro o -6x^{2} ko 6x^{2}.

$$-7x^{2}+21x-14x+8+6x^{2}$$

Pahekotia te 21x me -14x, ka 7x.

$$-7x^{2}+7x+8+6x^{2}$$

Pahekotia te -7x^{2} me 6x^{2}, ka -x^{2}.

$$-x^{2}+7x+8$$