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2. (a+b)² - (a-b)²=a²+2ab+b²-(a²-2ab+b²)=a²+2ab+b²-a²+2ab-b²=4ab
3. 5(x-3)² + 5x²=5(x²-6x+9)+5x²=5x²-30x+45+5x²=10x²-30x+45
4. (9x-1)² + (9x-1) (9x+1)=81x²-18x+1+81x²-1=192x²-18x
5. (7x - 5) (7x +5) - 49x² =49x²-25-49x²= -25
2. (a+b)² - (a-b)²=a²+2ab+b²-(a²-2ab+b²)=a²+2ab+b²-a²+2ab-b²=4ab
3. 5(x-3)² + 5x²=5(x²-2*3x+3²)+5x²=5(x²-6x+9)+5x²=5x²-30x+45+5x²=
10x²-30x+45
4. (9x-1)² + (9x-1) (9x+1)=(9x)²-2*9x*1+1²+(9x)²-1²=81x²-18x+1+
+81x²-1=162x²-18x
5. (7x - 5) (7x +5) - 49x²=(7x)²-5²-49x²=49x²-25-49x²=-25
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2. (a+b)² - (a-b)²= a²+2ab+b²-a²+2ab-b²=4ab
3. 5(x-3)² + 5x²= 5(x²-6x+9) +5x²= 5x²-30x+45 +5x²= 10x²-30x+45
4. (9x-1)² + (9x-1) (9x+1)= 81x²-18x+1+81x²-1= 162x²-18x
5. (7x - 5) (7x +5) - 49x² = 49x²-25 -49x²= -25