What is the value of b^2 - 4ac for the following equation?

2x^2 - 2x - 1 = 0

a. -4
b. 0
c. 12

Given abcd ac=38 and ae=3x+4 find the value of x

Can someone me with this? i’m not sure what to put for my equations.

Julie begins counting backwards from 1000 by 2’s and at the same time tony begins counting forward from 100 by 3’s.   if they count at the same rate, what number will they say at the same time?