Enrhifo
2m-1
Ehangu
2m-1
Rhannu
Copïo i clipfwrdd
4m^{2}-2m-\left(4m^{2}-4m+1\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(2m-1\right)^{2}.
4m^{2}-2m-4m^{2}+4m-1
I ddod o hyd i wrthwyneb 4m^{2}-4m+1, dewch o hyd i wrthwyneb pob term.
-2m+4m-1
Cyfuno 4m^{2} a -4m^{2} i gael 0.
2m-1
Cyfuno -2m a 4m i gael 2m.
4m^{2}-2m-\left(4m^{2}-4m+1\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(2m-1\right)^{2}.
4m^{2}-2m-4m^{2}+4m-1
I ddod o hyd i wrthwyneb 4m^{2}-4m+1, dewch o hyd i wrthwyneb pob term.
-2m+4m-1
Cyfuno 4m^{2} a -4m^{2} i gael 0.
2m-1
Cyfuno -2m a 4m i gael 2m.
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