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

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 $-3\le x\le 6$.
(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 $2x^2-7x<9$.


Show Answer Show Explanation