What is (2sqrt(7)+ 3sqrt(2))* (sqrt(7)- 5*sqrt(2))?

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Answer 1 · 2015-09-29T11:55:35

#-(16+7sqrt14)#

#(2*sqrt(7)+ 3*sqrt(2))* (sqrt(7)- 5*sqrt(2))#

#=2sqrt7^2-10sqrt7*sqrt2+3sqrt2*sqrt7-15sqrt2^2#

#=2*7-7sqrt2*sqrt7-15*2#

#=14-30-7sqrt(2*7)#

#=-16-7sqrt14#
or:
#=-(16+7sqrt14)#

What is (2*sqrt(7)+ 3*sqrt(2))* (sqrt(7)- 5*sqrt(2))?