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2014-05-24T15:13:28+02:00
2) ( 5 * ( x - 3 ) )* ( 2x - 4 )
=( 5x - 15 ) * ( 2x - 4 )
=10x² + 20x - 30x + 60
=10x² - 10x +60

3) 10x² -10x +60
   = 10 * 5² -10 * 5 +60
   = 10 * 25 - 10 * 5 +60
   = 250 - 50 +60
    =260 cm 3