Explicit Formula

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An explicit formula is a mathematical expression that explicitly defines the relationship between the terms of a sequence or a function. This formula allows us to directly calculate any term of the sequence or function without having to go through the process of finding the previous terms or values. Explicit formulas are widely used in various fields of mathematics, including number theory, calculus, and geometry, to name a few.

In the context of sequences, an explicit formula is typically represented as a formula that directly gives the value of the nth term of the sequence in terms of n. For example, consider the sequence {2, 4, 6, 8, 10, …}. The explicit formula for this sequence is given by an = 2n, where a represents the nth term of the sequence. Using this formula, we can easily compute any term of the sequence by substituting the value of n into the formula. For instance, to find the 7th term of the sequence, we simply substitute n=7 into the formula: a7 = 2(7) = 14.

Explicit formulas are particularly useful when dealing with arithmetic and geometric sequences, where the relationship between successive terms is well defined. In an arithmetic sequence, each term is obtained by adding a constant difference to the previous term, while in a geometric sequence, each term is obtained by multiplying the previous term by a constant ratio. The explicit formula for an arithmetic sequence is given by an = a1 + (n-1)d, where a1 is the first term and d is the common difference, while the explicit formula for a geometric sequence is given by an = a1 * r^(n-1), where r is the common ratio.

Explicit formulas are also widely used in calculus to represent functions that can be expressed in closed form. In calculus, functions are often represented as series expansions, where an infinite series of terms converges to the value of the function. An explicit formula for a function allows us to directly compute the value of the function at any point without having to sum an infinite number of terms. For example, the explicit formula for the sine function is given by sin(x) = x – x^3/3! + x^5/5! – x^7/7! + …, where the terms of the series converge to the value of the sine function at each point x.

In geometry, explicit formulas are used to represent the relationship between the variables of geometric figures, such as the sides of a triangle or the dimensions of a solid. For example, the explicit formula for the area of a triangle is given by A = 1/2 * base * height, where the area A is directly calculated in terms of the base and height of the triangle. Similarly, the explicit formula for the volume of a cylinder is given by V = πr^2h, where the volume V is directly calculated in terms of the radius r and height h of the cylinder.

Overall, explicit formulas play a crucial role in mathematics by providing a systematic way to represent and calculate the values of sequences, functions, and geometric figures. These formulas enable mathematicians and scientists to efficiently analyze and solve complex mathematical problems without having to resort to lengthy computations or approximations. Explicit formulas serve as a powerful tool for understanding the underlying patterns and relationships in mathematical structures, and they continue to be a key component of mathematical research and education.

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