just a warning. not 100% sure if this is right, its just what i did. and yes its legal math. i think lol.
so i distributed the 2 to the 0.5x, getting just x. then multiplying that x by 4 getting 4x. next i just distributed the 4x to the 6x-2. getting the answer bc multiplying an x by an x gets you and x^2. so you get 24x^2 (bc 4 times 6 is 24) and -8x bc 4x times -2 is -8x