WAEC Mathematics 2017 Theory — Question 12

Question 12 of 25 from the West African Examinations Council (WAEC) Mathematics 2017 Theory paper, with the correct answer and a full explanation.

7(b) Using scales of 2cm to 1 unit on the x-axis and 2cm to 4 units on the y-axis, draw the graph of y=2x^2-7x-9 for -3≤x≤6

Model answer

Plot the points from the completed table (x,y pairs from part (a)) on graph paper using the given scales, and draw a smooth curve through the points to form the parabola.

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