00:01
Right, we just need to factor this, or we need to set this equal to zero and then factor it.
00:07
So this was the original problem given, right? and so we could move this 64 over to the other side by subtracting both sides by 64.
00:17
And that would set this equation equal to zero.
00:21
So we have x squared plus 12x minus 64 equals zero.
00:27
And now we just have to factor rate.
00:29
So we need to know a number that multiplies to equal 64, or negative 64, and adds to give you a positive 12.
00:47
Right? and whenever you think about it, the only answer choice that works is going to be 12 and 4, 64 divided by 4 is 16.
01:08
Sorry, so 16 and 4.
01:13
Right? that'll give you, 16 times 4 is a positive 64.
01:16
We need a negative 64 and a positive 12...