Datrys (7x-5)(7x+3)-(7x-5)(8x+2)

$$(7x-5)(7x+3)-(7x-5)(8x+2)$$

Enrhifo

$$\left(1-x\right)\left(7x-5\right)$$

Camau Ateb

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 7x-5 gan bob 7x+3.

$$49x^{2}+21x-35x-15-\left(7x-5\right)\left(8x+2\right)$$

Cyfuno 21x a -35x i gael -14x.

$$49x^{2}-14x-15-\left(7x-5\right)\left(8x+2\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 7x-5 gan bob 8x+2.

$$49x^{2}-14x-15-\left(56x^{2}+14x-40x-10\right)$$

Cyfuno 14x a -40x i gael -26x.

$$49x^{2}-14x-15-\left(56x^{2}-26x-10\right)$$

I ddod o hyd i wrthwyneb 56x^{2}-26x-10, dewch o hyd i wrthwyneb pob term.

$$49x^{2}-14x-15-56x^{2}-\left(-26x\right)-\left(-10\right)$$

Gwrthwyneb -26x yw 26x.

$$49x^{2}-14x-15-56x^{2}+26x-\left(-10\right)$$

Gwrthwyneb -10 yw 10.

$$49x^{2}-14x-15-56x^{2}+26x+10$$

Cyfuno 49x^{2} a -56x^{2} i gael -7x^{2}.

$$-7x^{2}-14x-15+26x+10$$

Cyfuno -14x a 26x i gael 12x.

$$-7x^{2}+12x-15+10$$

Adio -15 a 10 i gael -5.

$$-7x^{2}+12x-5$$

Ehangu

$$-7x^{2}+12x-5$$

Camau Ateb

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 7x-5 gan bob 7x+3.

$$49x^{2}+21x-35x-15-\left(7x-5\right)\left(8x+2\right)$$

Cyfuno 21x a -35x i gael -14x.

$$49x^{2}-14x-15-\left(7x-5\right)\left(8x+2\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 7x-5 gan bob 8x+2.

$$49x^{2}-14x-15-\left(56x^{2}+14x-40x-10\right)$$

Cyfuno 14x a -40x i gael -26x.

$$49x^{2}-14x-15-\left(56x^{2}-26x-10\right)$$

I ddod o hyd i wrthwyneb 56x^{2}-26x-10, dewch o hyd i wrthwyneb pob term.

$$49x^{2}-14x-15-56x^{2}-\left(-26x\right)-\left(-10\right)$$

Gwrthwyneb -26x yw 26x.

$$49x^{2}-14x-15-56x^{2}+26x-\left(-10\right)$$

Gwrthwyneb -10 yw 10.

$$49x^{2}-14x-15-56x^{2}+26x+10$$

Cyfuno 49x^{2} a -56x^{2} i gael -7x^{2}.

$$-7x^{2}-14x-15+26x+10$$

Cyfuno -14x a 26x i gael 12x.

$$-7x^{2}+12x-15+10$$

Adio -15 a 10 i gael -5.

$$-7x^{2}+12x-5$$