If f(x) = 4x2 - 3 and g(x) = x+1, find (f - g)(x).
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G(x)=-x+0. Any equation reflected across the x axis will have the opposite x value as the original function. Hope this helps!
(f(x) in red, g(x) in blue)
(f(x) in red, g(x) in blue)
Since the lines are parallel and you know the slope of 
is -2, you know the slope of line 
will also be -2. You can see on the coordinate grid that line crosses the y-axis at -1. When you piece all of these facts together into slope-intercept form you get = -2x - 1.