Datrys (y-2)(y2+2y+4)-(y2+1)(y-1)

$$( y - 2 ) ( y 2 + 2 y + 4 ) - ( y 2 + 1 ) ( y - 1 )$$

Enrhifo

$$2y^{2}-y-y_{2}-7$$

Camau Ateb

Cyfrifwch y briodoledd ddosrannol drwy luosi pob y-2 gan bob y_{2}+2y+4.

$$yy_{2}+2y^{2}+4y-2y_{2}-4y-8-\left(y_{2}+1\right)\left(y-1\right)$$

Cyfuno 4y a -4y i gael 0.

$$yy_{2}+2y^{2}-2y_{2}-8-\left(y_{2}+1\right)\left(y-1\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob y_{2}+1 gan bob y-1.

$$yy_{2}+2y^{2}-2y_{2}-8-\left(y_{2}y-y_{2}+y-1\right)$$

I ddod o hyd i wrthwyneb y_{2}y-y_{2}+y-1, dewch o hyd i wrthwyneb pob term.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y-\left(-y_{2}\right)-y-\left(-1\right)$$

Gwrthwyneb -y_{2} yw y_{2}.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y+y_{2}-y-\left(-1\right)$$

Gwrthwyneb -1 yw 1.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y+y_{2}-y+1$$

Cyfuno yy_{2} a -y_{2}y i gael 0.

$$2y^{2}-2y_{2}-8+y_{2}-y+1$$

Cyfuno -2y_{2} a y_{2} i gael -y_{2}.

$$2y^{2}-y_{2}-8-y+1$$

Adio -8 a 1 i gael -7.

$$2y^{2}-y_{2}-7-y$$

Ehangu

$$2y^{2}-y-y_{2}-7$$

Camau Ateb

Cyfrifwch y briodoledd ddosrannol drwy luosi pob y-2 gan bob y_{2}+2y+4.

$$yy_{2}+2y^{2}+4y-2y_{2}-4y-8-\left(y_{2}+1\right)\left(y-1\right)$$

Cyfuno 4y a -4y i gael 0.

$$yy_{2}+2y^{2}-2y_{2}-8-\left(y_{2}+1\right)\left(y-1\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob y_{2}+1 gan bob y-1.

$$yy_{2}+2y^{2}-2y_{2}-8-\left(y_{2}y-y_{2}+y-1\right)$$

I ddod o hyd i wrthwyneb y_{2}y-y_{2}+y-1, dewch o hyd i wrthwyneb pob term.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y-\left(-y_{2}\right)-y-\left(-1\right)$$

Gwrthwyneb -y_{2} yw y_{2}.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y+y_{2}-y-\left(-1\right)$$

Gwrthwyneb -1 yw 1.

$$yy_{2}+2y^{2}-2y_{2}-8-y_{2}y+y_{2}-y+1$$

Cyfuno yy_{2} a -y_{2}y i gael 0.

$$2y^{2}-2y_{2}-8+y_{2}-y+1$$

Cyfuno -2y_{2} a y_{2} i gael -y_{2}.

$$2y^{2}-y_{2}-8-y+1$$

Adio -8 a 1 i gael -7.

$$2y^{2}-y_{2}-7-y$$