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alex7881
26.11.2020 •
Mathematics
Casey. Casey bought a 15.4 pound turkey and an 11.6 pound ham for thanksgiving and paid $38.51. Her friend Jane bought a 10.2 pound turkey and a 7.3 pound ham from the same store and paid $24.84. Find the cost per pound of turkey and the cost per pound of ham
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Ответ:
9514 1404 393
7 +5i or 7 -5i
Step-by-step explanation:
If the two numbers are represented by x and y, then ...
x+y = 14
xy = 74
Substituting for y, we have ...
x(14 -x) = 74
x^2 -14x +49 = -74 +49 . . . . . multiply by -1, complete the square
(x -7)^2 = -25 . . . . . . . . . . . write as a square
x -7 = ±√(-25) = ±5i . . . . take the square root
x = 7 ± 5i . . . . . . . . . . . add 7
One of the numbers is 7 +5i.