8x-5=23+4x 8x-5-4x=23+4x-4x 4x-5=23 4x-5+5=23+5 4x=28 4x/4=28/4 x=7
16x2 - 25 = (4x + 5) ( 4x - 5)
16x2 - 25 = (4x + 5) (4x - 5)
16x2 + 40x + 25 = 16x2 + 20x + 20x + 25 = 4x(4x + 5) + 5(4x + 5) = (4x + 5)(4x + 5) = (4x + 5)2
4x+5 = -9 4x = -9-5 4x = -14 x = -3.5
4x = 20 x = 5 (divide both sides by 4)
4x - 3 = 5 4x = 5 + 3 4x = 8 x = 8/4 x = 2
8x^2 + 6x - 5 = 8x^2 + 10x - 4x - 5 = 2x * (4x + 5) - (4x + 5) = (2x -1) * (4x + 5)
4x-5=7 4x=12 x=3
5+4x-7 = 4x+3-x 4x-2 = 3x+3 4x-3x = 3+2 x = 5
7x-5+2x=3-4x+12 7x+2x-5=3+12-4x 9x-5=15-4x 9x+4x-5=15-4x+4x 13x-5=15 13x-5+5=15+5 13x=20 13x/13=20/13 x=20/13
(4x-5)(4x+5)