Datrys x^2-(1+y)^2

$$x ^ { 2 } - ( 1 + y ) ^ { 2 }$$

Enrhifo

$$-\left(y+1\right)^{2}+x^{2}$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(1+y\right)^{2}.

$$x^{2}-\left(1+2y+y^{2}\right)$$

I ddod o hyd i wrthwyneb 1+2y+y^{2}, dewch o hyd i wrthwyneb pob term.

$$x^{2}-1-2y-y^{2}$$

Ehangu

$$x^{2}-y^{2}-2y-1$$

Camau Ateb

Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(1+y\right)^{2}.

$$x^{2}-\left(1+2y+y^{2}\right)$$

I ddod o hyd i wrthwyneb 1+2y+y^{2}, dewch o hyd i wrthwyneb pob term.

$$x^{2}-1-2y-y^{2}$$