the vertext is (0,0)

and some points are (1,1) (-1,1) (2,4)(-2,4)

draw that and connect it. its not a straight line but it is curved.

f(x) = x^2

x y

-5.00000 25.00000

-4.80000 23.04000

-4.60000 21.16000

-4.40000 19.36000

-4.20000 17.64000

-4.00000 16.00000

-3.80000 14.44000

-3.60000 12.96000

-3.40000 11.56000

-3.20000 10.24000

-3.00000 9.00000

-2.80000 7.84000

-2.60000 6.76000

-2.40000 5.76000

-2.20000 4.84000

-2.00000 4.00000

-1.80000 3.24000

-1.60000 2.56000

-1.40000 1.96000

-1.20000 1.44000

-1.00000 1.00000

-0.80000 0.64000

-0.60000 0.36000

-0.40000 0.16000

-0.20000 0.04000

0.00000 0.00000

0.20000 0.04000

0.40000 0.16000

0.60000 0.36000

0.80000 0.64000

1.00000 1.00000

1.20000 1.44000

1.40000 1.96000

1.60000 2.56000

1.80000 3.24000

2.00000 4.00000

2.20000 4.84000

2.40000 5.76000

2.60000 6.76000

2.80000 7.84000

3.00000 9.00000

3.20000 10.24000

3.40000 11.56000

3.60000 12.96000

3.80000 14.44000

4.00000 16.00000

4.20000 17.64000

4.40000 19.36000

4.60000 21.16000

4.80000 23.04000

5.00000 25.00000