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What is the value of x?  

x + 2/15 = x + 1/5.

 

 

A)x = 1/2

B)x = 10

C)x = -1/2

D)x = -10

 

 

 If s(x) = 2x^2 + 3x - 4, and t(x) = x + 4 then s(x) ยท t(x) =

 

 

A)2x^3 + 11x^2 + 8x - 16

B)2x^3 + 5x^2 + 16x - 16

C)3x^3 + 7x^2 + 8x + 16

D)3x^3 - 11x^2 + 16x + 16

Guest Aug 16, 2017
 #1
avatar+87571 
+1

(x + 2) / 15 =  (x + 1 ) / 5         cross-multiply

 

5 ( x + 2)  = 15 (x + 1)    simplify

 

5x + 10  = 15x  + 15       subtract 15, 5x from both sides

 

-5 = 10x                   divide both sides by 10

 

-5 / 10  = x  =  -1/2

 

 

 

 If s(x) = 2x^2 + 3x - 4, and t(x) = x + 4 

 

s(x) * t (x )  =       [ 2x^2 + 3x - 4 ]  [ x + 4 ]     =    [ 2x^3 + 3x^2 - 4x  + 8x^2 + 12x - 16 ]  =

 

 [ 2x^3 + 11x^2  + 8x  - 16 ]

 

 

 

cool cool cool                           

CPhill  Aug 16, 2017

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