Enrhifo
\left(x-y-4\right)\left(x+y\right)
Ehangu
x^{2}-4x-y^{2}-4y
Rhannu
Copïo i clipfwrdd
x^{2}-4x+4-\left(y+2\right)^{2}
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(x-2\right)^{2}.
x^{2}-4x+4-\left(y^{2}+4y+4\right)
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(y+2\right)^{2}.
x^{2}-4x+4-y^{2}-4y-4
I ddod o hyd i wrthwyneb y^{2}+4y+4, dewch o hyd i wrthwyneb pob term.
x^{2}-4x-y^{2}-4y
Tynnu 4 o 4 i gael 0.
x^{2}-4x+4-\left(y+2\right)^{2}
Defnyddio'r theorem binomaidd \left(a-b\right)^{2}=a^{2}-2ab+b^{2} i ehangu'r \left(x-2\right)^{2}.
x^{2}-4x+4-\left(y^{2}+4y+4\right)
Defnyddio'r theorem binomaidd \left(a+b\right)^{2}=a^{2}+2ab+b^{2} i ehangu'r \left(y+2\right)^{2}.
x^{2}-4x+4-y^{2}-4y-4
I ddod o hyd i wrthwyneb y^{2}+4y+4, dewch o hyd i wrthwyneb pob term.
x^{2}-4x-y^{2}-4y
Tynnu 4 o 4 i gael 0.
Enghreifftiau
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y = 3x + 4
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\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
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\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}