Enrhifo
-\left(a-b\right)^{2}+81
Ehangu
81-b^{2}+2ab-a^{2}
Rhannu
Copïo i clipfwrdd
81-\left(a^{2}-2ab+b^{2}\right)
Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(a-b\right)^{2}.
81-a^{2}+2ab-b^{2}
I ddod o hyd i wrthwyneb a^{2}-2ab+b^{2}, dewch o hyd i wrthwyneb pob term.
81-\left(a^{2}-2ab+b^{2}\right)
Defnyddio'r theorem binomaidd \left(p-q\right)^{2}=p^{2}-2pq+q^{2} i ehangu'r \left(a-b\right)^{2}.
81-a^{2}+2ab-b^{2}
I ddod o hyd i wrthwyneb a^{2}-2ab+b^{2}, dewch o hyd i wrthwyneb pob term.
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