Bonjour;
E = (2x+5)(1-4x)-2x(x-3)
= 2x -8x² +5 -20x -2x² +6x
= - 10x² -12x +5
x= -1
( - 10) ( -1²) -12*(-1) +5
= 10+12+5
= 27
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Bonjour;
E = (2x+5)(1-4x)-2x(x-3)
= 2x -8x² +5 -20x -2x² +6x
= - 10x² -12x +5
x= -1
( - 10) ( -1²) -12*(-1) +5
= 10+12+5
= 27