Posted by luna on Tuesday, November 22, 2011 at 2:59pm.
This is an example of why we always get everything on the left side, then factor to make the product zero:
(x+4)(x-12) = 5x
x^2 - 8x - 48 = 5x
x^2 - 13x - 48 = 0
(x-16)(x+3) = 0
Now we have a zero product. That means that if any of the factors is zero, then the product is also zero.
So, x = -3 or 16
Now do the same steps with the second equation
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