Enrhifo
-\left(x-2y\right)^{2}+5.11
Ehangu
5.11-4y^{2}+4xy-x^{2}
Rhannu
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5.11-\left(x^{2}-4xy+4y^{2}\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(x-2y\right)^{2}.
5.11-x^{2}+4xy-4y^{2}
I ddod o hyd i wrthwyneb x^{2}-4xy+4y^{2}, dewch o hyd i wrthwyneb pob term.
5.11-\left(x^{2}-4xy+4y^{2}\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(x-2y\right)^{2}.
5.11-x^{2}+4xy-4y^{2}
I ddod o hyd i wrthwyneb x^{2}-4xy+4y^{2}, dewch o hyd i wrthwyneb pob term.
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