How industrializing can cause acid rain?
SO4 released from factories will react with water in the atmosphere and make H2SO4, which is sulfuric acid, and cause acid rain.
x^2 + 2x - 8
We need to find two number that will multiply to 8, which is 4 and 2, or 8 and 1. Since the middle term is 2x, the sum of a positive 4 and a negative 2 will give us 2. With that we start putting things together and get (x - 2) (x + 4) We distribute them to make sure we are right: x * x + 4x - 2x - 8 = x^2 + 2x - 8 Next, we find x: (x -2 ) = 0 add 2 to both side and we x = -2. (x + 4) = 0 subtract 4 to both side and we get x = -4
18 + 2(3x + 4) +5x
First we distribute the 2 by multiply it to 3x and 4: 18 + 6x + 8 + 5x Now, combine like terms 18 + 8 and 6x + 5x: 26 + 11x