Oblicz:
a) (2x+1)²- (3x-1) (3x+1)
b) 2(x-1) (x+1) - 4 (5x-2)²
a) (2x+1)²- (3x-1) (3x+1)=
=4x²+4x+1-9x²+1=
=-5x²+4x+2
b) 2(x-1) (x+1) - 4 (5x-2)²=
=2(x²-1)-4(25x²-20x+4)=
=2x²-2-100x²+80x-16=
=-98x²+80x-18
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a) (2x+1)²- (3x-1) (3x+1)=
=4x²+4x+1-9x²+1=
=-5x²+4x+2
b) 2(x-1) (x+1) - 4 (5x-2)²=
=2(x²-1)-4(25x²-20x+4)=
=2x²-2-100x²+80x-16=
=-98x²+80x-18