3 years ago

2x2-9x+1=0 value of discrimination and number of real solutions

1 answer:

5 0

$2 \times 2 - 9x + 1 = 0 \\ \\ 1. \: - 9x + 5 = 0 \\ 2. \: - 9x = - 5 \\ 3. \: \frac{ - 9x}{ - 9} = \frac{ - 5}{ - 9} \\ x = \frac{5}{9} \\ or \\ \\ 1. \: 4 - 9x + 1 = 0 \\ 2. \: - 9x + 5 = 0 \\ 3. \: - 9x = - 5 \\ 4. \: x = \frac{ - 5}{ - 9} \\ 5. \: x = \frac{5}{9}$

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A single microvillus is a rod-like structure that is 1.0 μm in height. it has a hemispherical top approximately 0.1 μm in diamet

andre [41]

The surface area of the cylinder that forms the "sides" of the microvillus rod is given by the area of the curved surface of a cylinder with diameter (d) = 0.1 μm and height (h) = 1.0 μm.

The curved surface area of a cylinder is given by 2πrh, where r = d / 2 = 0.1 / 2 = 0.05 μm.

Thus, the curved surface area is given by

$2(3.14)(0.05)(1.0) = 3.14 \times 10^{-11}\mu m^2$

Therefore, the surface area of the cylinder that forms the "sides" of the microvillus rod is $3.14 \times 10^{-11}\mu m^2$