a) M. a. = a+b/2 => 2+8/2 =5
M.g= [tex] \sqrt{a * b} [/tex] => [tex] \sqrt{2*8} = \sqrt{10} [/tex]
b) M.a= √7 +√3 +√7 -√3 / 2 = 2√7 /2 = √7
M.g= [tex] \sqrt{( \sqrt{7}+ \sqrt{3})( \sqrt{7}- \sqrt{3} ) } = \sqrt{ (\sqrt{7} ^{2})- ( \sqrt{3}^{2}) } = \sqrt{7-3} = \sqrt{10} [/tex]