a) 25+10x+x²
b) 16 - 24x + 9x²
c) 9x²-1
d) 2x² -2x+3x -1 = 2x²+x -1
e) 5+2V5+1 -2*5 -2V5 = 6 - 10 = -4
f) 4x²-40x+25 -(9x²+12x+4) + x²+8x+16 = 5x²-32x + 41 - 9x²-12x-4 = -4x²-44x+37
Răspuns:
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