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Equality holds when...

Source:

January 11, 2009
algebrapolynomialVieta

Problem Statement

If a20 a_2 \neq 0 and r r and s s are the roots of a_0 \plus{} a_1x \plus{} a_2x^2 \equal{} 0, then the equality a_0 \plus{} a_1x \plus{} a_2x^2 \equal{} a_0\left (1 \minus{} \frac {x}{r} \right ) \left (1 \minus{} \frac {x}{s} \right ) holds: <spanclass=latexbold>(A)</span> for all values of x,a00 <span class='latex-bold'>(A)</span>\ \text{for all values of }x, a_0\neq 0 <spanclass=latexbold>(B)</span> for all values of x <span class='latex-bold'>(B)</span>\ \text{for all values of }x (C)\ \text{only when }x \equal{} 0 (D)\ \text{only when }x \equal{} r \text{ or }x \equal{} s (E)\ \text{only when }x \equal{} r \text{ or }x \equal{} s, a_0 \neq 0