00:01
For this problem, we're given an equation, 5x squared plus x minus 2 equals 0, and we're asked to solve this equation using the quadratic formula.
00:10
I have the quadratic formula on the screen here in red, but before we use that, let's first define our three variables, a, b, and c.
00:18
So a is the coefficient in front of x squared, which is 5.
00:23
B is the coefficient for x, which since there's nothing here in front of x, we know that's just positive 1.
00:29
And then lastly, c is our last number here, which is negative 2.
00:35
Now that we have our variables defined, let's go ahead and plug them into our quadratic formula.
00:40
So using the formula, x is equal to negative b, so that's negative 1, plus or minus the square root of b squared, so 1 squared, minus 4 times a, which is 5, times c, which is negative 2...