Consider the 2nd order linear equation with constant coefficients: y" + ay + by = 0. %3D If ri and r2 are the roots of its characterisitic equation, then what is r? + r? A. 1 B. Va? - 46 C. a2-4b D. a2 + 2b E. a2 - 26 Select one: O aE ObA OCD Od8 Oec

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