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Oct 31, 2017
 #1
avatar+9488 
+1

e.   To make factoring easier, rearrange the 25 - 20x + 4x2 .

 

     6x211x106x25x664x4x220x+25

 

Now we need to factor all the numerators and denominators. Start by splitting their middle terms.

 

=   6x2+4x15x106x29x+4x664x4x210x10x+25

                                                                            Now factor by grouping.

=   2x(3x+2)5(3x+2)3x(2x3)+2(2x3)64x2x(2x5)5(2x5)

 

=   (3x+2)(2x5)(2x3)(3x+2)2(2x3)(2x5)(2x5)

                                                                           Multiply the fractions together.

=   (3x+2)(2x5)(2)(2x3)(2x3)(3x+2)(2x5)(2x5)

                                                                           Cancel the common terms.

=   (3x+2)(2x5)(2)(2x3)(2x3)(3x+2)(2x5)(2x5)

 

=   (2)(2x5)

 

=   - 22x5

 

And  x  ≠  3/2  or  -2/3   since these cause a zero in the denominator of the original expression.

Oct 31, 2017
 #1
avatar+130466 
+1
Oct 31, 2017

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