If a

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(A) Let $f(x) = (x - a)(x - c) + 2(x - b)(x - d)$.Since $f(x)$ is a quadratic polynomial with a positive leading coefficient,we evaluate $f(x)$ at $x

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Real and distinct

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(A) Let $f(x) = (x - a)(x - c) + 2(x - b)(x - d)$.Since $f(x)$ is a quadratic polynomial with a positive leading coefficient,we evaluate $f(x)$ at $x = a, b, c, d$:$f(a) = (a - a)(a - c) + 2(a - b)(a - d) = 2(a - b)(a - d)$. Since $a  0$.$f(b) = (b - a)(b - c) + 2(b - b)(b - d) = (b - a)(b - c)$. Since $b > a$ and $b  0$ and $(b - c) $f(c) = (c - a)(c - c) + 2(c - b)(c - d) = 2(c - b)(c - d)$. Since $c > b$ and $c  0$ and $(c - d) $f(d) = (d - a)(d - c) + 2(d - b)(d - d) = (d - a)(d - c)$. Since $d > a$ and $d > c$,$(d - a) > 0$ and $(d - c) > 0$,so $f(d) > 0$.Since $f(a) > 0$ and $f(b) Since $f(c)  0$,there exists a root in $(c, d)$.Thus,the equation has two real and distinct roots.

If $a < b < c < d$,then the roots of the equation $(x - a)(x - c) + 2(x - b)(x - d) = 0$ are

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