I need help answering this question? i know to do the problem :
As shown: (2r+3)(2r-1)=-(3r+1)
you foil and then destibute the negative.
i got 4r2nd -2r+6r-3=-3r-1 then i combine like terms
4r2nd +4r-3=-3-1 then i combine liker terms to opposite sides and i got
4r2nd+7r-2=0
i need to use magic x to solve .
so i did 2rx2
2rx1 and i got 4r+2r=6r<------- this 6r is suppose to add up to 7r.
Can someone help me out ????