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Pure Mathematics
 Online Tutoring : Quiz : Pure Mathematics
Solve quadratic equation Check your score
  Play           Question 40 of 58 in this category.    

Solve this quadratic equation:
  3x + 5 = 2x
 
A.
x = 1  or  x =
5
2

 
B.
x = -1  or  x =
5
2

 
C.
x = 1  or  x = - 
5
2

 
D.
x = -1  or  x = - 
5
2

 

 
  * Quiz question created by Zach on 01 July 2005 at 4:12pm

 
 
 
 
 
 

 




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Solution of quadratic equation


3x +5 = 2x^2

(3x + 5) - (3x + 5) = 2x^2 - (3x + 5)

0 = 2x^2 - 3x - 5

2x^2 - 3x - 5 = 0

(2x - 5) (x + 1) = 0

2x - 5 = 0 or x + 1 = 0

[(2x - 5) + 5 = 0 +5] or [(x+1) - 1 = 0 - 1]

(2x - 5 + 5 = 5) or (x +1 - 1 = -1)

2x = 5 or x = -1

2x  2 = 5  2 or x = -1

x = 5  2 or x = -1

 

 


so answer is B

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