10) Efectuați calculele:
a) (2x+3)²+5(x - 1)²-(3x + 1)²;
c) (x+3)(x-3) - (x + 1)²;
e) 9(x + 1)(x-1)-(3x + 1)²;
)?(r+ 5)² - 4(x+2)(x-2)+2x(x-3).
1)
b) (4x-3)²+(3x + 2)²-(5x-4)²;
d) (x-1)(x+4)-(x + 2)(x-2);
f) (3x+5)(3x-5)+(5x+6)²-(x+5)(x-5);