Enrhifo
8a
Ehangu
8a
Rhannu
Copïo i clipfwrdd
4a^{2}+4a+1-\left(2a-1\right)^{2}
Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(2a+1\right)^{2}.
4a^{2}+4a+1-\left(4a^{2}-4a+1\right)
Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(2a-1\right)^{2}.
4a^{2}+4a+1-4a^{2}+4a-1
I ddod o hyd i wrthwyneb 4a^{2}-4a+1, dewch o hyd i wrthwyneb pob term.
4a+1+4a-1
Cyfuno 4a^{2} a -4a^{2} i gael 0.
8a+1-1
Cyfuno 4a a 4a i gael 8a.
8a
Tynnu 1 o 1 i gael 0.
4a^{2}+4a+1-\left(2a-1\right)^{2}
Defnyddio'r theorem binomaidd \left(p+q\right)^{2}=p^{2}+2pq+q^{2} i ehangu'r \left(2a+1\right)^{2}.
4a^{2}+4a+1-\left(4a^{2}-4a+1\right)
Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(2a-1\right)^{2}.
4a^{2}+4a+1-4a^{2}+4a-1
I ddod o hyd i wrthwyneb 4a^{2}-4a+1, dewch o hyd i wrthwyneb pob term.
4a+1+4a-1
Cyfuno 4a^{2} a -4a^{2} i gael 0.
8a+1-1
Cyfuno 4a a 4a i gael 8a.
8a
Tynnu 1 o 1 i gael 0.
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