A teacher gave 20 pupils a maths test and recorded the results in the stem-and-leaf diagram below.
How many pupils scored 48 in the test?
Test marks
089
1|3 47 79
2| 48
3|5
4 |1 888
5| 3 4 6 7 99
Key
1|3 represents 13 marks

a4 - 3a2 - 1

step-by-step explanation:

step   1   :

equation at the end of step   1   :

  ((a4) -   3a2) -   1

step   2   :

trying to factor by splitting the middle term

2.1     factoring   a4-3a2-1  

the first term is,   a4   its coefficient is   1 .

the middle term is,   -3a2   its coefficient is   -3 .

the last term, "the constant", is   -1  

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