Datrys (a+b)^2-b(2a+b)

$$( a + b ) ^ { 2 } - b ( 2 a + b )$$

Enrhifo

$$a^{2}$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(a+b\right)^{2}.

$$a^{2}+2ab+b^{2}-b\left(2a+b\right)$$

Defnyddio’r briodwedd ddosbarthu i luosi b â 2a+b.

$$a^{2}+2ab+b^{2}-\left(2ba+b^{2}\right)$$

I ddod o hyd i wrthwyneb 2ba+b^{2}, dewch o hyd i wrthwyneb pob term.

$$a^{2}+2ab+b^{2}-2ba-b^{2}$$

Cyfuno 2ab a -2ba i gael 0.

$$a^{2}+b^{2}-b^{2}$$

Cyfuno b^{2} a -b^{2} i gael 0.

$$a^{2}$$

Ehangu

$$a^{2}$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(a+b\right)^{2}.

$$a^{2}+2ab+b^{2}-b\left(2a+b\right)$$

Defnyddio’r briodwedd ddosbarthu i luosi b â 2a+b.

$$a^{2}+2ab+b^{2}-\left(2ba+b^{2}\right)$$

I ddod o hyd i wrthwyneb 2ba+b^{2}, dewch o hyd i wrthwyneb pob term.

$$a^{2}+2ab+b^{2}-2ba-b^{2}$$

Cyfuno 2ab a -2ba i gael 0.

$$a^{2}+b^{2}-b^{2}$$

Cyfuno b^{2} a -b^{2} i gael 0.

$$a^{2}$$