If , has positive real roots only, then is equal to…

MATHEMATICS · Single correct · AoPS · Mathematics · Quadratic Equations - Part 2 · Quadratic Equations - Part 2

Problem

If 16x4−32x3+ax2+bx+1=016x^4 - 32x^3 + ax^2 + bx + 1 = 0 , a,b∈Ra, b \in R has positive real roots only, then a−ba - b is equal to : (a) -32 (b) 32 (c) 49 (d) -49

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