Enrhifo
-45\left(m+n\right)^{2}+20
Ehangu
20-45n^{2}-90mn-45m^{2}
Rhannu
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20-45\left(m^{2}+2mn+n^{2}\right)
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(m+n\right)^{2}.
20-45m^{2}-90mn-45n^{2}
Defnyddio’r briodwedd ddosbarthu i luosi -45 â m^{2}+2mn+n^{2}.
20-45\left(m^{2}+2mn+n^{2}\right)
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(m+n\right)^{2}.
20-45m^{2}-90mn-45n^{2}
Defnyddio’r briodwedd ddosbarthu i luosi -45 â m^{2}+2mn+n^{2}.
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