F(x)=-x^4+3x^2+x-2. Please answer the following word problem and the problem after.?

Clyde modified some water pipes so that the water flow could be modeled by the graph f(x)=-x^4+3x^2+x-2. Graph f(x)=-x^4+3x^2+x-2 by making a table of values of x between which the real zeros are located. Please give me a table of values and tell me where the real zeros are located..but i think i have a good idea.