The derivative gives us the slope of that line at any point. So what is f prime of x? f prime of x is just the derivative of this. So 3 times 8 is 24 times x squared. 24x squared, f prime of 1 half is equal to 24 times 1 half squared, which is equal to 24 times 1 fourth, which is equal to 6. So the slope of this line is equal to 6. I'll use m for slope.