Find the zeros of the polynomial 4x²-9 graphically

Answer :
Let
y = 4x² - 9
Step 1 -  Form a table for different values of x As:
 

y = 4x2 - 9
x	y
0	-9
1	-5
1.5	0
-1	-5
-1.5	0

Step 2- draw these points on x - y plane As :



So,

x = $\pm \frac{3}{2}$                     ( Ans )