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

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

Enrhifo

$$-b\left(2a+b\right)$$

Camau Ateb

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

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

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

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

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

$$-2ab-b^{2}$$

Ehangu

$$-2ab-b^{2}$$

Camau Ateb

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

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

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

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

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

$$-2ab-b^{2}$$