broyochey1
12.07.2019 •
Mathematics
Rosa brought d drawings to an art show. after selling 14 of them, she had 34 left. identify the equation that represents this situation and the correct solution. a. d + 14 = 34; d = 20 b. d + 14 = 34; d = 48 c. d – 14 = 34; d = 20 d. d – 14 = 34; d = 48
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Ответ:
Answer
2(x + 4)(x - 3)
The trick here is to notice that all 3 terms can be div. by 2:
2(x^2 + x - 12)
Note that -12 factors into -3 * 4 or -4 * 3. The pair {4, -3} leads to the correct sign for the middle term of the product.
x^2 + x - 12 = (x + 4)(x - 3), and so 2x2 + 2x − 24 = 2(x + 4)(x - 3).