我見識到GCSE既Maths卷啦...
我覺得俾一個香港中三既學生，都一定pass到....
對我黎講，份卷過份容易....
其中一個test：
You scored 10 out of 10
1. Write x2 + 8x + 2 in the form (x + b)2 + c
You said (x + 4)2 - 14 .
Well done - you remembered that 'b' was half the coefficient of x and completed the square correctly.
2. Write x2 + 3x + 1 in the form (x + b)2 + c
What is the value of b?
You said 3/2 .
Well done - you remembered that 'b' is half the coefficient of x!
3. The equation 2x2 + 8x - 3 is to be solved by completing the square.
Which of the following is a correct step in the solution:
You said (x + 2)2 = 11/2 .
Well done - you remembered to divide everything by 2.
4. Write 9x2 + 12x + 7 in the form (px + q) 2 + r
What is the value of r?
You said 3 .
Well done!
5.
The equation x2 + 7x - 3 = 0 is to be solved using the quadratic formula above.
What are the values of a, b and c?
You said a = 1, b = 7, c = -3 .
Well done!
6. If the equation x = 4 - x2 is to be solved using the quadratic formula.
What are the values of a, b and c?
You said a = 1, b = 1, c = -4 .
Well done, you rearranged the equation correctly!
7. If the equation 2x2 + 3x - 1 = 0 is to be solved using the quadratic formula.
What is the value of b2 - 4ac?
You said 17 .
Well done, you substituted the values of a, b and c correctly!
8. The graphs of y = 3 - x2 and y = x + 1 are shown:
Use the graphs to find solutions to the simultaneous equations y = 3 - x2 and y = x + 1.
You said x = 1, y = 2 and x = -2, y = -1 .
Well done - you found the coordinates of the points where the two lines cross!
9. What are the solutions of the simultaneous equations x2 + y2 = 4 and x = y - 2?
You said x = -2, y = 0 and x = 0, y = 2 .
Well done, you solved the equations correctly!
10. Eliminate 'y' from the following simultaneous equations:
y = 1 - x
y = x2 - 1
What quadratic equation is formed?
You said x2 + x - 2 = 0 .
Well done, you rearranged the equation x2 - 1 = 1 - x.
[ Last edited by oscar on 2005-5-7 at 09:46 PM ] |
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發表於 7/5/2005 10:41 PM