2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4
x + 2x + 6x = 9x
3x + 2x - 8x + 2x = -x
2x2 + 2x = 2x(x+1)
(2x + 1) + (x*x - 2x + 1) = x^2 + 2x - 2x + 1 + 1 = x^2 + 2
4
Differentiate term by term. d/dx[X2 + 2X) = 2X + 2 slope(m) = 2 ------------------
Complete the square. X^2 + 2X halve the linear term ( 2 ), square it and add to polynomial X^2 + 2X + 1
2x + x + 4 +2x = x + 20 5x + 4 = x + 20 5x - x = 20 - 4 4x = 16 x = 4
x + 2x + 6x = 9x
6x with 3 over the x, because that is how many x's there are.
X=7
x plus 2 = x + 2 x plus x = 2x
x=1
5x + x - 6x + 2x = 2x
If it is 3x2 + 4 = 2x + 4, then you can subtract 4 from both sides, and get 3x2 = 2x, and then x = 2/3
x + 2x + 423 = 3x + 423