Answers

2016-04-05T21:27:18+05:30
4x²+9-12x-8x+12 4x²-20x+21 4x²-14x-6x+21 2x(2x-7)-3(2x-7) (2x-3)(2x-7)=0 2x-3=0 or 2x-7=0 x=3/2 or x=7/2
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2016-04-06T09:36:17+05:30
(2 x- 3)² - 8 x + 12 
 = 4x
² + 9 - 12x - 8x + 12
 = 4x² - 20x + 21
= 4x² -  14x - 6x + 21
= 2x ( 2x - 7 ) -3 ( 2x - 7 )
= ( 2x - 3 )( 2x - 7 )
⇒ x =3/2 and x = 7/2
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