Uma maneira de realizar a operação 9972 - 9 de forma rápida e correta é calculando 1 000 * 994, que é igual a 994 000. A igualdade que justifica esse fato está expressa em: a) (a + b)² = a² + b² + 2ab
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b) a² - b² = (a + b)(a - b)
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c) a² - b² = (a - b)²
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d) (a - b)² = a² - 2ab + b²
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e) a² - b² = 1 000(a + b)

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.

Leo has b boxes of pencils. each box contains 6 pencils. he has a total of 42 pencils. the equation that represents this situation the value of b that makes the equation true the first one is b+6=42,6b=42,b=42+6,or 42b=6 the second one are 7,836 48

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g