x multiplied by itself.
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If you are looking for the angle between a line and another, then it is usually represented by Ө (theta). If you're looking for the gradient of a line, use m = rise/run or m = y2 - y1 / x2 - x1 , where m is the gradient, (x1,y1) and (x2,y2) are two fixed points on the cartesian plane.
x2 + x2 + x2 = (1 + 1 + 1)x2 = 3x2
3x4 plus 5x3 plus x2 - 5 divided by x 2 =[(3x4) + (5x3) + (x2 - 5)]/x2 =(12 + 15 + x2 -5)/x2 =(27 - 5 + x2)/x2 =(22 + x2)/x2
x2 - 4
x2 - (2x)2 = x2 - 4x2 = -3x2 x2 - 2x2 = -x2