Sagot :
a = ( 2x + 1 ) ( x - 5 )
= 2x * x + 2x * (-5) + 1 * x + 1 * (-5)
= 2x^2 - 10x + 1x - 5
= 2x^2 -9x - 5
= 2x * x + 2x * (-5) + 1 * x + 1 * (-5)
= 2x^2 - 10x + 1x - 5
= 2x^2 -9x - 5
