karankhatri1946
19.08.2019 •
Mathematics
Three red rods are 2cm longer than two blue rods. three blue rods are 2cm longer than four red rods. how long is each rod?
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Ответ:
b = (3/2)r - 1
"Three blue rods are 2 cm longer than four red rods"
3b = 4r + 2
3[(3/2)r - 1] = 4r + 2
(9/2)r - 3 = 4r + 2
(1/2)r = 5
r = 10 cm
b = (3/2)(10 cm) - 1
b = 14 cm
Ответ:
49b^2 + 42b + 9 = (7b + 3) * (7b + 3) = (7b + 3)^2 = 7^2b^2 + 2 * 3 * 7b + 3^2 = 49b^2 + 42b + 9
The correct result would be a. (7b + 3)^2.