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CBSE Class 9 Answered

f(x)= ax^7+bx^3+cx-5 where a,b,c are consonants. If f(-7) = 7 then, f(7)=?
Asked by adityaahuja099 | 01 Dec, 2017, 06:20: PM
answered-by-expert Expert Answer
begin mathsize 16px style straight f left parenthesis straight x right parenthesis equals ax to the power of 7 plus bx cubed plus cx minus 5 straight f left parenthesis negative 7 right parenthesis equals straight a open parentheses negative 7 close parentheses to the power of 7 plus straight b open parentheses negative 7 close parentheses cubed plus straight c open parentheses negative 7 close parentheses minus 5 equals 7 minus open parentheses straight a open parentheses 7 close parentheses to the power of 7 plus straight b open parentheses 7 close parentheses cubed plus straight c open parentheses 7 close parentheses plus 5 close parentheses equals 7 straight a open parentheses 7 close parentheses to the power of 7 plus straight b open parentheses 7 close parentheses cubed plus straight c open parentheses 7 close parentheses equals negative 7 minus 5 equals negative 13 straight f left parenthesis 7 right parenthesis equals straight a open parentheses 7 close parentheses to the power of 7 plus straight b open parentheses 7 close parentheses cubed plus straight c open parentheses 7 close parentheses minus 5 equals negative 13 minus 5 equals negative 18 end style
Answered by Arun | 01 Dec, 2017, 07:13: PM

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