(a) Copy and complete the table of values for the relation y = 4x\(^2\) - 8x - 21, for -2.0 \(\leq\) x \(\leq\) 4.0 

x	-2.0	-1.5	-1.0	0.5	0.0	0.5	1.0	1.5	2.0	2.5	3.0	3.5	4.0
y	11		-9		-21	-24			-21		-9	0

 

(b) Using a scale of 2cm to 1 unit on the x-axis and 2cm to 5 units on the y-axis, draw the graph for the relation y = 4x\(^2\) - 8x - 21

(ii) Use the graph to find the solution set of 

(\(\alpha\)) 4x\(^2\) - 8x = 3;

(\(\beta\)) 4x\(^2\) - 7x - 21 = 0