SAT试题类型 Mathematics Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　If square root = square root , which of the following must be true?

　　Answer Choices

　　 a = 0

　　 b = 0

　　 a + b = 0

　　 a minus b = 0

　　 + = 0

　　答案:B

　　解析:

　　Explanation

　　Squaring both sides of the equation square root = square root gives the equation x minus a = x + b. Subtracting x from both sides now gives negative a = b, or a + b = 0