Question

expand the following
(2x-3y)³ ??
and what is parallel line and perpendicular lines ?????​

Answer 1

Answer:

given (2x - 3y)³

by using identity (a - b)³ = a³ - b³ - 3a²b + 3ab²

here a = 2x and b = 3y

= (2x)³ - (3y)³ - 3(2x)²(3y) + 3(2x)(3y)²

= 8x³ - 27y³ - 36x²y + 54xy²

1. parallel line are the lines that do not meet at any point.
2. perpendicular line is a line which stands on a straight line and makes an angle of 90degree

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