There is a formula for the "difference of squares." In this case, the answer is (5b - 14c)(5b + 14c)
It is: 14c-5c = 9c
14C is the radioactive isotope of carbon.
The most common element used is the element Carbon. More precisely, Carbon 14 or simply 14C, an isotope of Carbon (same number of protons but two more neutrons than plain old 12C, the most common variety of carbon) is used. All living organism have 14C and the amount of 14C in a living organism is constant throughout it's life. However, as the creature dies, the 14C level drops. The rate of drop is know precisely. Therefore, by measuring how much 14C is in the remains, the time the organism died can be known (usually to within decades).
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Common Isotopes of Carbon are 12C (6 neutrons), 13C (7 neutrons), and 14C (8 neutrons).
14c + c + 12 = 15c + 12 = 3(5c + 4)
Carbon-14 (14C) has 6 protons and 8 neutrons in its nucleus, along with 6 electrons orbiting the nucleus in energy levels. The arrangement of subatomic particles in 14C follows the standard structure of a carbon atom.
2 x 2 x 7 x 7 x c x c
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The symbol for the radioactive isotope Carbon-14 is ^14C.
It is an expession that can be simplified to: 6c