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a = (2x+1)(x-5) devellopper et reduire a

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a = (2x+1)(x-5)
   = 2x²-10x+x-5
   = 2x²-9x-5
a = ( 2x + 1 ) ( x - 5 )
= 2x * x + 2x * (-5) + 1 * x + 1 * (-5)
= 2x^2 - 10x + 1x - 5
= 2x^2 -9x - 5