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AMC10 2002 A

AMC10 2002 A · Q10

AMC10 2002 A · Q10. It mainly tests Quadratic equations, Factoring.

Compute the sum of all the roots of $(2x + 3)(x - 4) + (2x + 3)(x - 6) = 0$.
计算 $(2x + 3)(x - 4) + (2x + 3)(x - 6) = 0$ 所有根之和。
(A) 7/2 7/2
(B) 4 4
(C) 5 5
(D) 7 7
(E) 13 13
Answer
Correct choice: (A)
正确答案:(A)
Solution
(A) Factor to get $(2x+3)(2x-10)=0$, so the two roots are $-3/2$ and $5$, which sum to $7/2$.
(A)因式分解得 $(2x+3)(2x-10)=0$,所以两个根为 $-3/2$ 和 $5$,它们的和为 $7/2$。
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