2x-4 = 20 2x = 20+4 2x = 24 x = 12
4-2x-9 = -19 -2x = -19-4+9 -2x = -14 x = 7
-2x - 2 = 4-2x = 4 + 2-2x = 6x = 6/-2x = -3Check:-2(-3) - 2 = 46 - 2 = 44 = 4
2x + 4 = 2 2x = -2 x = -1
4
–4
4
2x-4 = 20 2x = 20+4 2x = 24 x = 12
If 3X - 4 ------ = 0 1-2X-4 So 3X - 4 ----- = 0 [ x (2X-3) ] 2X-3 3X-4 = 2X-3 [ -2X ] X - 4 = -3 [ +4 ] X= 1
6
What is X if 2x + 4 = 36 What is X ? 2x + 4 = 36
2x - 4 = -10 2x = -10 +4 2x = -6 x = -3
4 - 2x = 10 -2x = 10-4 -2x = 6 -x = 3 x = -3
(2x + 4)(2x - 4) to check your answer, use the FOIL method (first, outside, inside, last) F.... 2x x 2x = 4x^2 0.... 2x x -4 = -8x I..... 2x x 4 = 8x L.... 4 x -4 = -16 so 4x^2 - 16 = (2x + 4)(2x - 4)
2X divided by 4= 2X
2x+4 = -16 2x = -16-4 2x = -20 x = -10
4-2x-9 = -19 -2x = -19-4+9 -2x = -14 x = 7