Răspunsuri

2014-09-04T12:49:11+03:00
1. 2x-4=2(x-2)
2. (x+1)²-9=[(x+1)+3)]·[(x+1)-3]
3. (x+5)²-25y²=[(x+5)+5y]·[(x+5)-5y]
2014-09-04T12:50:10+03:00
1.    2x - 4 = 2(x - 2)

2.    (x + 1)² - 9  = [(x + 1) - 3] [(x + 1) + 3] = (x - 2)(x + 4)

3.    (x + 5)² - 25y² =[(x + 5) - 5y] [(x + 5) + 5y] = (x - 5y + 5)(x + 5y + 5)

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