No 8 dan 9 mohon bantuannya ya mas mbak

8.6√10+3√25 = 6√10 + 3.5 = 6√10 +15
9.7-3=4

Semoga Bermanfaat

8.
[tex] = 3 \sqrt{5} (2 \sqrt{2} + \sqrt{5} )[/tex]
[tex] = 6 \sqrt{10} + 3 \sqrt{25} [/tex]
[tex] = 6 \sqrt{10} [/tex]
[tex] = 6 \sqrt{10} + 15[/tex]
9.
[tex] = ( \sqrt{7} + \sqrt{3} )( \sqrt{7} - \sqrt{3} )[/tex]
[tex] = \sqrt{49} - \sqrt{21} + \sqrt{21} - \sqrt{ \sqrt{9} } [/tex]
[tex] = 7 - 3 \\ = 4[/tex]