Enrhifo
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Ehangu
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Rhannu
Copïo i clipfwrdd
81x^{2}-72xy+16y^{2}
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(-9x+4y\right)^{2}.
81x^{2}-72xy+16y^{2}
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(-9x+4y\right)^{2}.
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