Date | November 2020 | Marks available | 2 | Reference code | 20N.1.SL.TZ0.T_11 |
Level | Standard Level | Paper | Paper 1 (with calculator from previous syllabus) | Time zone | Time zone 0 |
Command term | State | Question number | T_11 | Adapted from | N/A |
Question
The diagram shows the graph of the quadratic function , with vertex .
The equation has two solutions. One of these solutions is .
Write down the other solution of .
Complete the table below placing a tick (✔) to show whether the unknown parameters and are positive, zero or negative. The row for has been completed as an example.
State the values of for which is decreasing.
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure. It appeared in a paper that permitted the use of a calculator, and so might not be suitable for all forms of practice.
OR (M1)
Note: Award (M1) for correct calculation of the left symmetrical point.
(A1) (C2)
[2 marks]
(A1)(A1) (C2)
Note: Award (A1) for each correct row.
[2 marks]
OR (A1)(A1) (C2)
Note: Award (A1) for seen as part of an inequality, (A1) for completely correct notation. Award (A1)(A1) for correct equivalent statement in words, for example “decreasing when is greater than negative ”.
[2 marks]