Doprowadź do najprostszej postaci, a nastepnie oblicz wartość liczbową wyrażenia
x = - 1/2
a) 3x (4xkwadrat -2x +5 ) +6x (x - 1) - (x - 2)
b) -x (x + 1) + (x +2) (x-2) - (3x - 1) * (-3)
SZYBKO DAJE NAJ
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3x (4xkwadrat -2x +5 ) +6x (x - 1) - (x - 2)
12x do potegi 3 -6x kwadrat+15x +6x kwadrat-6x-x+2=
12x³+14x+2=
12*(-1/2)³ +14*(-1/2)+2=
12* (-1/8)+(-7)+2=
-1,5-7+2=-6,5
-x (x + 1) + (x +2) (x-2) - (3x - 1) * (-3)
-x²-x+x²-2x+2x-4-3x+-3
2x-7
2*(-1/2)-7=-1-7=-8