Square of the other

Algebra Level 3

If one root of the equation a x 2 + b x + c = 0 ax^2 + bx + c = 0 be the square of other, then b 3 + a 2 c + a c 2 = b^3 + a^2c + ac^2 =

This problem is a part of the set - 1's & 2's & QuEsTiOnS
2 a b c 2abc 4 a b c 4abc 7 a b c 7abc 3 a b c 3abc a b c abc 5 a b c 5abc

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2 solutions

Avinash Singh
Mar 21, 2015

acc. to question the root of the eqation eqal to m and m^2

Now>>>> b a = m ( m + 1 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . e q a t i o n 1 \frac{-b}{a}=m(m+1)............................eqation1 c a = m 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . e q a t i o n 2 \frac{c}{a}=m^{3}............................eqation2

from eqation 1 and 2 ......we get value of b c = m 2 + m m 3 \frac{-b}{c}=\frac{m^2+m}{m^3}

a ( m 2 + m ) = b a(m^2+m)=-b now putting the value of m from eqation 2 here we get b = a 2 c 1 3 + c 2 a 1 3 . . . . . . . . . . . . . . . . . . . e q a t i o n 3 -b=a^2c^\frac{1}{3}+c^2a^\frac{1}{3}...................eqation3

NOW putting the value of m from eq2 to ax^2+bx+c we wil get

b 3 + a 2 c + a c 2 = 3 a c ( a 2 c 1 3 + c 2 a 1 3 ) b^3+a^2c+ac^2=-3ac(a^2c^\frac{1}{3}+c^2a^\frac{1}{3})

so using eqation3 we get the result as 3abc

Rakshith Lokesh
Apr 22, 2018

on substituting a,b,c=1..we get w,w^2 as root s of the equation....then put the value and get the result

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