So let me just redraw it here, just so that I like drawing on the black background, I guess is the main reason why I'm redrawing it. So the function f of x is equal to 8x to the third, looks like this. It looks like that. This is our f of x axis, and this is our x axis. And we want the equation for the line tangent at x is equal to 1 half. So this is x is equal to 1 half. If you go up here, if you evaluate f of 1 half, you get 8 times 1 half to the third, which is 8 times 1 eighth, which is 1.