Question:If` a/b = 4/5` and` b/c = 15/16,` then` (c^2 - a^2)/(c^2 + a^2) = ?` 

A `1/7` 
B `7/25` 
C `3/4` 
D None 

+ Answer
B 

+ Explanation
`a/c = a/b xx b/c = 4/5 xx 15/16 = 3/4`

`:. (c^2 - a^2)/(c^2 + a^2)`

`= (1 - a^2/c^2)/(1 + a^2/c^2)`

`= (1 - 9/16)/(1 + 9/16)`

`= 7/16 xx 16/25`

`= 7/25`

+ Report

Irin Moni

Editor, VCampus

Your Name

Your Email

Type of Report
Spelling MistakeIncorrect AnswerGrammar MistakeContent MissingImproper Text FormatInsufficient AnswerDuplicate QuestionImproper Sentence StructureImproper Equation/FormulaOther

Description