quadratic equation

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.4: Complex And Rational Zeros Of Polynomials
Problem 14E
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prove that if one solution for a quadratic equation of the form x^2 + bx + c = 0 is rational (where b and c are rational), then the other solution is also rational. (Use the fact that if the solutions of the equation are r and s, then x^2 + bx + c = (x-r)(x-s).)

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