几道SAT2的数学题1.what is the remainder when the polynomial x^4-5x

问题描述：

几道SAT2的数学题
1.what is the remainder when the polynomial x^4-5x^2-10x-12 is divided by x+2
2.what are the asymptote of f(x)= 6x^2/4-x^2
我知道x=2和x=-2 但是不知道y=-6 是怎么算出来的
3.what is the y-intercept of the line tangent to the circle x^2+y^2=1 at the point (3/5,4/5)
不太懂题目的意思
4.Given the statement " If ∠ABC is a right angle,then it measures 90 ," an indirect proof of the statement could begin with which of the following assumptions?
A.∠ABC does not measures 90
B.∠ABC measures 90
C.∠ABC is a right angle
D.∠ABC is an obtuse angle
E.∠ABC measures 30
不太懂题目的意思
5.by the rational roos test,how many possible rational roots does f(x)=4x^3-x^2+10x-6 have?
f(x)=(x-2)^3+6 关于X轴对称的方程怎么算？
f(x)=∣x-1∣- 5 关于 y=-5 对称的方程怎么算？

1个回答分类：数学 2014-10-14

问题解答：

我来补答

1.问remainder,把x=-2带入 x^4-5x^2-10x-12 =,答案就是余数(你也可以用常除法,根据题目意思,不过速度很慢）
2.我通常是画图,毕竟都是选择题
3.what is the y-intercept of the line tangent to the circle x^2+y^2=1 at the point (3/5,4/5)
圆x^2+y^2=1与线性方程在点(3/5,4/5）相切,这条线性方程的截距是?（翻译出来应该就明白了吧,我第一次也没读懂
4.Given the statement " If ∠ABC is a right angle,then it measures 90 ," an indirect proof of the statement could begin with which of the following assumptions?
如果是∠ABC是一个直角,那么度数是90.可以直接得出下面那个假设?
5.by the rational roos test,how many possible rational roots does f(x)=4x^3-x^2+10x-6 have?
f(x)=4x^3-x^2+10x-6 可能有哪些有理根?
（可以用笛卡尔规则or看degree?）
你补充的那2个问题.
1.f(x)=(x-2)^3+6
f(x)=-(x-2)^3-6
2.f(x)=∣x-1∣- 5 关于 y=-5 对称的方程怎么算?
感觉很麻烦.哪上面来的?
我不知道方法
如果考试遇到时间充裕就画图,取点,拟合个方程.（通常放弃
这是选择题吧,画图,带值,排除..
再问：第5题的答案有16个根知道是怎么做出来的么？还有第4题答案应该选哪个？那个答案上写的是A

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