Biiiaaask
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16) Calculati:
a) 5(3x la a 2-5x+6)-4(5x la a 2-6x+7)-3(-x la a 2+2x-2)
b)6(-x la a 2-3x+5)-7(2x la a 2 -4x+6)+5(5x la a 2+2x-1)

Răspuns :

Miky93ask
a)15x² -25x +30 -20x² +24x -28 +3x² -6x +6=

=18x² -20x² -59x+24x +36=

= -2x²  -35x +36

b)-6x²-18x +30 -14x²+28x  -42  +25x² +10x -5=

= -20x² +25x² +20x +30 -47=

= 5x ²+20x -17

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