2017/6/26 14:37:18来源:互联网作者:上海新航道
摘要:SAT数学对于中国考生来说,相对比较能拿到高分,上海新航道培训学校给考生们带来SAT数学函数题库,希望对各位考生们备考提供帮助。
SAT数学对于中国考生来说,相对比较能拿到高分,上海新航道培训学校给考生们带来SAT数学函数题库,希望对各位考生们备考提供帮助。
Read the following SAT test question and then click on a button to select your answer.
Which of the following expressions is equivalent to16x^4-81?
A.(4x^3-9)(4x+9)
B.(2x-3)(2x+3)(4x^2-9)
C.(2x-3)(2x+3)(4x^2+9)
D.(2x-3)^4
重点单词:
factor ['f?kt?] n. 因素,因子
multiple ['m?ltipl] adj. 许多,多种多样的
equivalent [i'kwiv?l?nt] adj. 等价的,相等的
答案:C
解析:
A quick look at the answer choices tells us that we will want to factor the given expression.
Recall that a difference of squares of the form a^2-b^2 factors to (a-b)(a+b).
Because 16x^4 and 81 are both perfect squares, the expression 16x^4-81 is a
difference of squares and can be factored as follows: 16x^4-81=(4x^2-9)(4x^2+9)
Note that the binomial (4x^2-9) also is a difference of squares. Therefore, we can continue our factorization as follows: (4x^2-9)(4x^2+9)=(2x-3)(2x+3)(4x^2+9)
16x^4-81 is equivalent to: (2x-3)(2x+3)(4x^2+9)
以上就是SAT数学函数题型,更多相关的资料,请点击:SAT数学频道
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