21 lines
268 B
Plaintext
21 lines
268 B
Plaintext
T = 7
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D = 9
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d = t * (T - t)
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d = tT - t²
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for which range of t is d > D?
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0 >= t >= T
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10 = t7 - t²
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10 = - t² + t7
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-10 = t² - 7t
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3.5² - 10 = t² - 7t + 3.5²
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49/4 - 10 = t² - 7t + 49/4
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9/4 = (t - 7/2)²
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t - 7/2 = 3/2 or -3/2
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t = 10/2 or 4/2
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5, 2
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(5 + 1) - 2 = 4
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