Réitigh 5(x+15)^2-7=0

$$5 ( x + 15 ) ^ { 2 } - 7 = 0$$

Réitigh do x.

$$x=\frac{\sqrt{35}}{5}-15\approx -13.816784043$$

$$x=-\frac{\sqrt{35}}{5}-15\approx -16.183215957$$

Céimeanna tríd an bhFréamh Chearnach a Fháil

Cuir 7 leis an dá thaobh den chothromóid.

$$5\left(x+15\right)^{2}-7+7=7$$

Má dhealaítear 7 uaidh féin faightear 0.

$$5\left(x+15\right)^{2}=7$$

Roinn an dá thaobh faoi 5.

$$\frac{5\left(x+15\right)^{2}}{5}=\frac{7}{5}$$

Má roinntear é faoi 5 cuirtear an iolrúchán faoi 5 ar ceal.

$$\left(x+15\right)^{2}=\frac{7}{5}$$

Tóg fréamh chearnach an dá thaobh den chothromóid.

$$x+15=\frac{\sqrt{35}}{5} x+15=-\frac{\sqrt{35}}{5}$$

Bain 15 ón dá thaobh den chothromóid.

$$x+15-15=\frac{\sqrt{35}}{5}-15 x+15-15=-\frac{\sqrt{35}}{5}-15$$

Má dhealaítear 15 uaidh féin faightear 0.

$$x=\frac{\sqrt{35}}{5}-15 x=-\frac{\sqrt{35}}{5}-15$$