Question 7

(a) Copy and complete the table of values for the equation \(y = 2x^{2} - 7x - 9\) for \(-3 \leq x \leq 6\).

x -3 -2 -1 0 1 2 3 4 5 6
y   13   -9 -14   -12   6  

(b) Using scales of 2cm to 1 unit on the x- axis and 2cm to 4 units on the y- axis, draw the graphs of \(y = 2x^{2} - 7x - 9\) for \(-3 \leq x \leq 6\).

(c) Use the graph to estimate the :

(i) roots of the equation \(2x^{2} - 7x = 26\);

(ii) coordinates of the minimum point of y;

(iii) range of values for which \(2x^{2} - 7x < 9\).

Theory

Question details

Exam body
WAEC
Subject
Mathematics
Year
2017
Question no.
#7
Type
Theory

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