Posted by meren on Saturday, June 30, 2012 at 6:33am.
if one zero of the quadratic polynomial 4xsquare + 5x+ gama be reciprocal of another zero, find the value of gama.

maths  MathMate, Saturday, June 30, 2012 at 8:52am
4x²+5x+γ=4(xk)(x1/k)
=4x²4(k+1/k)+1
Equate coefficients of terms:
for x²: 4=4
for x: 4(k+1/k)=5
for constant term: γ=1
So the equation is:
4x²+5x+1=0
(4x+1)(x+1)=0

maths  Reiny, Saturday, June 30, 2012 at 9:08am
let the roots be p and 1/p
We know that for ax^2 + bx + c = 0
the sum of the roots = b/a
product of roots = c/a
so in our case, product of the roots = gamma/4
but the product of roots = p(1/p) = 1
so
gamma/4 = 1
gamma = 4
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