Enrhifo
\left(7x-y\right)\left(7y-3x\right)
Ehangu
-21x^{2}+52xy-7y^{2}
Rhannu
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4x^{2}+12xy+9y^{2}-\left(4y-5x\right)^{2}
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(2x+3y\right)^{2}.
4x^{2}+12xy+9y^{2}-\left(16y^{2}-40yx+25x^{2}\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(4y-5x\right)^{2}.
4x^{2}+12xy+9y^{2}-16y^{2}+40yx-25x^{2}
I ddod o hyd i wrthwyneb 16y^{2}-40yx+25x^{2}, dewch o hyd i wrthwyneb pob term.
4x^{2}+12xy-7y^{2}+40yx-25x^{2}
Cyfuno 9y^{2} a -16y^{2} i gael -7y^{2}.
4x^{2}+52xy-7y^{2}-25x^{2}
Cyfuno 12xy a 40yx i gael 52xy.
-21x^{2}+52xy-7y^{2}
Cyfuno 4x^{2} a -25x^{2} i gael -21x^{2}.
4x^{2}+12xy+9y^{2}-\left(4y-5x\right)^{2}
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(2x+3y\right)^{2}.
4x^{2}+12xy+9y^{2}-\left(16y^{2}-40yx+25x^{2}\right)
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(4y-5x\right)^{2}.
4x^{2}+12xy+9y^{2}-16y^{2}+40yx-25x^{2}
I ddod o hyd i wrthwyneb 16y^{2}-40yx+25x^{2}, dewch o hyd i wrthwyneb pob term.
4x^{2}+12xy-7y^{2}+40yx-25x^{2}
Cyfuno 9y^{2} a -16y^{2} i gael -7y^{2}.
4x^{2}+52xy-7y^{2}-25x^{2}
Cyfuno 12xy a 40yx i gael 52xy.
-21x^{2}+52xy-7y^{2}
Cyfuno 4x^{2} a -25x^{2} i gael -21x^{2}.
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