Enrhifo
2\sqrt{5}\approx 4.472135955
Rhannu
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\sqrt{\left(-2\right)^{2}+\left(0-4\right)^{2}}
Tynnu 2 o 0 i gael -2.
\sqrt{4+\left(0-4\right)^{2}}
Cyfrifo -2 i bŵer 2 a chael 4.
\sqrt{4+\left(-4\right)^{2}}
Tynnu 4 o 0 i gael -4.
\sqrt{4+16}
Cyfrifo -4 i bŵer 2 a chael 16.
\sqrt{20}
Adio 4 a 16 i gael 20.
2\sqrt{5}
Ffactora 20=2^{2}\times 5. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 5} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{5}. Cymryd isradd 2^{2}.
Enghreifftiau
Hafaliad cwadratig
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometreg
4 \sin \theta \cos \theta = 2 \sin \theta
Hafaliad llinol
y = 3x + 4
Rhifyddeg
699 * 533
Matrics
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Hafaliad ar y pryd
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Gwahaniaethu
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integreiddiad
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Terfynau
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}