SAT数学Problem Solving练习题(28)

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摘要:下面是小站SAT频道为大家整理了SAT数学Problem Solving练习题(28),供考生们参考,以下是详细内容。

以下是小站SAT频道为大家整理了SAT数学Problem Solving练习题(28),供考生们参考,以下是详细内容。

Question 28: What are the solutions of the equation 5x(x + 1)·5x = 1?

(a) x1 = 0 and x2 = 2

(b) x1 = 0 and x2 = 1

(c) x1 = 2 and x2 = -2

(d) x1 = 0 and x2 = -2

(e) x1 = 1 and x2 = -2

Answer: The left side of the equation: 5x·(x + 1)·5x = 5x2 + 2x.

The right side of the equation: 1 = 50.

5x2 + 2x = 50

x2 + 2x = 0, x·(x + 2) = 0, and x1 = 0 and x2 = -2

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