Loading Web-Font TeX/Math/Italic

Special welcome gift. Get 30% off your first purchase with code “Eduma”. Find out more!

Question

If a^2-bc=α,b^2-ac=β,c^2-ab=γ
,what is\frac{aα+bβ+cγ}{(a+b+c)(α+β+γ)}
equal to ?

  1. a+b-c
  2. a-b+c
  3. a+b+c
  4. 1
Answer

\frac{a(a^2-bc) + b(b^2-ac) + c(c^2-ab)}{(a+b+c)(a^2-bc + b^2-ac + c^2-ab)}

\frac{a^3+b^3+c^3-3abc}{(a+b+c)(a^2+b^2+c^2-ab -bc -ca)}

\frac{a^3+b^3+c^3-3abc}{a^3+b^3+c^3-3abc}=1

Share:

Advertisment

You May Also Like