doprowadź do najprostszej postaci
1 (2+a)²+(2-a)²-2²-a²
2 (2x+4)²-4x²-16
3 9x²-25+(3x-5)(3x+5)-2x
4 (7-y)²+(y+7)²+1
1. (2+a)²+(2-a)²-2²-a²=4+4a+a²+4-4a+a²-4-a²=4+a²
2.'(2x+4)²-4x²-16=4x²+16x+16-4x²-16=16x
3. 9x²-25+(3x-5)(3x+5)-2x=9x²-25+ 9x²-25-2x=18x²-50-2x
4. (7-y)²+(y+7)²+1=49-14y+y²+y²+14y+49=2y²+98
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1. (2+a)²+(2-a)²-2²-a²=4+4a+a²+4-4a+a²-4-a²=4+a²
2.'(2x+4)²-4x²-16=4x²+16x+16-4x²-16=16x
3. 9x²-25+(3x-5)(3x+5)-2x=9x²-25+ 9x²-25-2x=18x²-50-2x
4. (7-y)²+(y+7)²+1=49-14y+y²+y²+14y+49=2y²+98