(a) Copy and complete the table of values for the relation $y=3x^2-5x-7$.

x	-3	-2	-1	0	1	2	3	4
y	35			-7	-9		5

(b) Using scales of 2 cm to 1 unit on the x- axis and 2 cm to 5 units on the y- axis, draw the graph of $y=3x^2-5x-7,-3\le x\le 4$.
(c) From the graph : (i) find the roots of the equation $3x^2-5x-7=0$ ; (ii) estimate the minimum value of y ; (iii) calculate the gradient of the curve at the point x = 2.


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