Oblicz:
a) 6x * ( 2x-1) + 4x * ( 4 - 3x ) dla x = -4,2
b) ( y -2 ) * ( y +3 ) - y * ( y - 6) dla y = - 1 i 1/7
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a) 6x * ( 2x-1) + 4x * ( 4 - 3x )
12x²-6x+16x-12x= 12x²-2x= 12*(-4,2)²-2*(-4,2)= 211,68+8,4=220,08
b) ( y -2 ) * ( y +3 ) - y * ( y - 6) = y²+3y-2y-6-y²+6y= 7y-6= 7*(-1 1/7)-6 =-8-6= -14