First you want to multiply 3 by the f and negative four so you will see -3f+12-10f2 and to make things less confusing, bring the last two and multiply it with the -10f so you get -20 f so you should have -3f + 12 - 20f. Now what you want to do is bring the - 20f on the other side so now you should be seeing -20f - 3f + 12, after this, you want to subtract the -20f and the -3f and you should have -23f because they both were negative, so now what you have and/or should be seeing is -23f+12 so now there is no other ways of manipulating this in any way shape or form so -23f + 12 should be your answer.
