WAEC Mathematics 2017 Theory — Question 11

Question 11 of 25 from the West African Examinations Council (WAEC) Mathematics 2017 Theory paper, with the correct answer and a full explanation.

7(a) Copy and complete the table of values for the equation y=2x^2-7x-9 for -3≤x≤6

Model answer

Substituting each x value into y=2x^2-7x-9: x=-3: y=2(9)+21-9=13x=-2: y=2(4)+14-9=8-... (the table values, worked from the equation, are x: -3,-2,-1,0,1,2,3,4,5,6 giving y: 30,13,0,-9,-14,-15,-12,-5,6,21 respectively).

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