Answer:
21.We want to express the express (x+y)/(x-y) as [ -2x / (y-x) ] - 1.
In order to form it into that form we will first take out -1 common from the denominator to get
(x+y)/(x-y) = - ( x+y)/ (y-x) . Now divide the numerator by the denominator, quotient being 1 and remainder 2x.
Thus we get: (x+y)/(x-y) = - ( x+y)/ (y-x) = - [ 1 + 2x / ( y-x) ] = -1 - 2x / ( y-x)
22. D.
23.Simplify square root of 3x^2
√3x2
Reorder 3 and x2.
√x2⋅3
Pull terms out from under the radical.
x√3
24. C.
