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G9 Mathematics KOI

Total questions: 20

Worksheet time: 1hrs 2mins

Name
Class
Date
1.

Solve the equation by factoring:

x2-6x+8=0

a)

x = 2 or x = 4

b)

x = -2 or x = -4

c)

x = -2 or x = 4

d)

x = 2 or x = -4

2.

Which answer choice correctly shows the quadratic equation above in factored form?

a)

(x + 7)(x - 2) = 0

b)

(x - 7)(x + 2) = 0

c)

(x - 7)(x - 2) = 0

d)

(x + 7)(x + 2) = 0

3.
Solve by taking the square root:
4x2 = 100
a)
-10, 10
b)
-25, 25
c)
-5, 5
d)
5
4.
Solve by factoring:
x2 - 16 = 0
a)
4
b)
-4
c)
-4, 4
d)
16
5.

Solve by factoring:

x2 + 2x - 20 = 4

a)

x = -6, x = 4

b)

x = 6, x = -4

c)

x = 12, x = -2

d)

x = 8, x = -3

6.

Solve by taking the square root:

7x2 + 1 = 8

a)

± 1

b)

± 7

c)

± √7

d)

± 8

7.

Solve by completing the square:

x2 + 10x = -9

a)

1 and -12

b)

-1 and -9

c)

1 and -9

d)

1 and -1

8.


Solve using the quadratic formula.

2p24p16=02p^2-4p-16=0  

a)

p = 2 or p = -1

b)

p = 1 or p = -2

c)

p = 4 or p = -2

d)

No solution

9.

Solve using the quadratic formula:

2x2 + 2x - 12 = 0

a)

-2 or 3

b)

2 or 3

c)

2 or -3

d)

-2 or -3

10.

已知(m-1)x|m|+1-3x+1=0是关于x的一元二次方程,则m= (a)  

11.

若一元二次方程ax2=b(ab>0)的两个不相等的实数根分别是2m

+1与m-7,则 ab\frac{a}{b} 为 (a)  

12.

用配方法解方程:3x2+6x-1=0

13.

已知x可取任何实数,则二次三项式-3x2+12x-11的最值情况是

a)

有最大值-1

b)

有最小值-1

c)

有最大值1

d)

有最小值1

14.

x=2±44×3×(1)2×3x=\frac{2\pm\sqrt[]{4-4\times3\times\left(-1\right)}}{2\times3} 是某个一元二次方程的根,则这个一元二次方程可以是

a)

3x2+2x-1=0

b)

2x2+4x-1=0

c)

-x2-2x+3=0

d)

3x2-2x-1=0

15.

小明在解方程x2-5x=-3的过程中出现了错误,其解答如下:

解:∵a=1,b=-5,c=-3,……第1步

∴b2-4ac=(-5)2-4×1×(-3)=37,……第2步

x=5±372x=\frac{5\pm\sqrt[]{37}}{2} ,……第3步

∴x1x=5+372x=\frac{5+\sqrt[]{37}}{2} ,x2x=5372x=\frac{5-\sqrt[]{37}}{2} .……第4步

小明的解答是从第 (a)   步开始出错的

16.

在实数范围内定义一种运算“*”,其规则为a*b=a(a-b),根据这个规则,方程(x+2)*5=0的解为

(a)  

17.

已知等腰△ABC的底边长为5,其腰长恰好是方程x2-2(m+1)x+6m-2=0的根,则m的值是

a)

2

b)

4

c)

1

d)

3

18.

已知关于x的一元二次方程(a+c)x2-4bx+4(c-a)=0,其中a,b,c分别为△ABC三边的长.

(1)如果方程有两个相等的实数根,试判断△ABC的形状,并说明理由;

(2)如果△ABC是等边三角形,试求这个一元二次方程的根.

19.

x2-5x=14

展示十字相乘法

20.

3x2+8x-3=0

展示十字相乘法