Tolong bantu jawab yg bener ya lagi perlu

13) [tex]L = \frac{4-x^{2}}{3- \sqrt{x^{2}+5 } } . \frac{3+ \sqrt{x^{2}+5 }}{3- \sqrt{x^{2}+5 }} [/tex]

[tex]L = \frac{(4-x^{2})(3+ \sqrt{x^{2}+5 })}{9- (x^{2}+5 )} [/tex]

[tex]L = \frac{(4-x^{2})(3+ \sqrt{x^{2}+5 })}{4- x^{2}} [/tex]

[tex]L =3+ \sqrt{x^{2}+5 }[/tex]

[tex]L =3+ \sqrt{2^{2}+5} =3+ \sqrt{9} [/tex]

[tex]L=6[/tex]