real numbers, question 19, grade 9

03/12/2016 Grade 9 16

19) Given:

AB = (\sqrt5-\sqrt2)(\sqrt5+\sqrt2)

,  

AC=\frac{{0.27\times60\times4}}{{3\times7+6\times{{10}^{-1}}}}

 

DB = {\left({\sqrt8-\sqrt3}\right)^2}+\sqrt{96}

,   and 

DC= \frac{{0.1+1}}{{\frac{1}{5}\times{{\left({\frac{{{3^0}}}{{\sqrt2}}}\right)}^2}}}

a)Calculate each of AB,AC,DB and DC.

b) What does (AD) represent to [DC]?Justify.