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1 Without using mathematical tables or a calculator, evaluate #(28 times )/(0645 times 2175)# 2 a)Expand the expression #(3x7)(2x7)# b)Without using long multiplication or a calculator, use the above expansion with an appropriate Let x, y, z > 0 satisfy x y y z z x 2 x y z = 1 Prove that 4 x y z ≥ 2 The condition invites the factoring ( 1 x) ( 1 y) ( 1 z) x y z − 2 = x y z, but having the factor 4 in the desired inequality makes things more difficult algebraprecalculus inequality Share asked at 1013 nan 1,035 5 16 Add a comment
