Datrys (7x^2-5x+8)-(3x^2-2x-5)-(x^2-4x+10)+(2x^2+3x-7)

$$( 7 x ^ { 2 } - 5 x + 8 ) - ( 3 x ^ { 2 } - 2 x - 5 ) - ( x ^ { 2 } - 4 x + 10 ) + ( 2 x ^ { 2 } + 3 x - 7 )$$

Enrhifo

$$5x^{2}+4x-4$$

Camau Ateb

I ddod o hyd i wrthwyneb 3x^{2}-2x-5, dewch o hyd i wrthwyneb pob term.

$$7x^{2}-5x+8-3x^{2}+2x+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Cyfuno 7x^{2} a -3x^{2} i gael 4x^{2}.

$$4x^{2}-5x+8+2x+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Cyfuno -5x a 2x i gael -3x.

$$4x^{2}-3x+8+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Adio 8 a 5 i gael 13.

$$4x^{2}-3x+13-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

I ddod o hyd i wrthwyneb x^{2}-4x+10, dewch o hyd i wrthwyneb pob term.

$$4x^{2}-3x+13-x^{2}+4x-10+2x^{2}+3x-7$$

Cyfuno 4x^{2} a -x^{2} i gael 3x^{2}.

$$3x^{2}-3x+13+4x-10+2x^{2}+3x-7$$

Cyfuno -3x a 4x i gael x.

$$3x^{2}+x+13-10+2x^{2}+3x-7$$

Tynnu 10 o 13 i gael 3.

$$3x^{2}+x+3+2x^{2}+3x-7$$

Cyfuno 3x^{2} a 2x^{2} i gael 5x^{2}.

$$5x^{2}+x+3+3x-7$$

Cyfuno x a 3x i gael 4x.

$$5x^{2}+4x+3-7$$

Tynnu 7 o 3 i gael -4.

$$5x^{2}+4x-4$$

Ehangu

$$5x^{2}+4x-4$$

Camau Ateb

I ddod o hyd i wrthwyneb 3x^{2}-2x-5, dewch o hyd i wrthwyneb pob term.

$$7x^{2}-5x+8-3x^{2}+2x+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Cyfuno 7x^{2} a -3x^{2} i gael 4x^{2}.

$$4x^{2}-5x+8+2x+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Cyfuno -5x a 2x i gael -3x.

$$4x^{2}-3x+8+5-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

Adio 8 a 5 i gael 13.

$$4x^{2}-3x+13-\left(x^{2}-4x+10\right)+2x^{2}+3x-7$$

I ddod o hyd i wrthwyneb x^{2}-4x+10, dewch o hyd i wrthwyneb pob term.

$$4x^{2}-3x+13-x^{2}+4x-10+2x^{2}+3x-7$$

Cyfuno 4x^{2} a -x^{2} i gael 3x^{2}.

$$3x^{2}-3x+13+4x-10+2x^{2}+3x-7$$

Cyfuno -3x a 4x i gael x.

$$3x^{2}+x+13-10+2x^{2}+3x-7$$

Tynnu 10 o 13 i gael 3.

$$3x^{2}+x+3+2x^{2}+3x-7$$

Cyfuno 3x^{2} a 2x^{2} i gael 5x^{2}.

$$5x^{2}+x+3+3x-7$$

Cyfuno x a 3x i gael 4x.

$$5x^{2}+4x+3-7$$

Tynnu 7 o 3 i gael -4.

$$5x^{2}+4x-4$$