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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