Datrys =0.8(x+3)(x-5)(x-7)

$$= 0.8 ( x + 3 ) ( x - 5 ) ( x - 7 )$$

Enrhifo

$$\frac{4\left(x-7\right)\left(x-5\right)\left(x+3\right)}{5}$$

Camau Ateb

Defnyddio’r briodwedd ddosbarthu i luosi 0.8 â x+3.

$$\left(0.8x+2.4\right)\left(x-5\right)\left(x-7\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 0.8x+2.4 gan bob x-5.

$$\left(0.8x^{2}-4x+2.4x-12\right)\left(x-7\right)$$

Cyfuno -4x a 2.4x i gael -1.6x.

$$\left(0.8x^{2}-1.6x-12\right)\left(x-7\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 0.8x^{2}-1.6x-12 gan bob x-7.

$$0.8x^{3}-5.6x^{2}-1.6x^{2}+11.2x-12x+84$$

Cyfuno -5.6x^{2} a -1.6x^{2} i gael -7.2x^{2}.

$$0.8x^{3}-7.2x^{2}+11.2x-12x+84$$

Cyfuno 11.2x a -12x i gael -0.8x.

$$0.8x^{3}-7.2x^{2}-0.8x+84$$

Ehangu

$$\frac{4x^{3}}{5}-\frac{36x^{2}}{5}-\frac{4x}{5}+84$$

Camau Ateb

Defnyddio’r briodwedd ddosbarthu i luosi 0.8 â x+3.

$$\left(0.8x+2.4\right)\left(x-5\right)\left(x-7\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 0.8x+2.4 gan bob x-5.

$$\left(0.8x^{2}-4x+2.4x-12\right)\left(x-7\right)$$

Cyfuno -4x a 2.4x i gael -1.6x.

$$\left(0.8x^{2}-1.6x-12\right)\left(x-7\right)$$

Cyfrifwch y briodoledd ddosrannol drwy luosi pob 0.8x^{2}-1.6x-12 gan bob x-7.

$$0.8x^{3}-5.6x^{2}-1.6x^{2}+11.2x-12x+84$$

Cyfuno -5.6x^{2} a -1.6x^{2} i gael -7.2x^{2}.

$$0.8x^{3}-7.2x^{2}+11.2x-12x+84$$

Cyfuno 11.2x a -12x i gael -0.8x.

$$0.8x^{3}-7.2x^{2}-0.8x+84$$