“What is the definition of slope?”

The slope of a line is a number that measures its "steepness", usually denoted by the letter m. It is the change in y for a unit change in x along the line. ... The slope of the line is continuously recalculated. You can also drag the origin point at (0,0). Slope can be calculated using rise/run.
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A surface of which one end or side is at a higher level than another; a rising or falling surface.

(m+11n)^2=(m+11n)(m+11n)=m^2+11mn+11mn+121n^2=m^2+22mn×121n^2 for example; use foil: (a+b)(a+b)first. a^2outside. abinside. ablast. b^2