EXAMPLE 10 Show that there is a root of the equation 6x- 8x +3x-2 = 0 between 1 and 2. SOLUTION Let f(x) = 6x 8x + 3x- 2= 0. We are looking for a solution of the given equation, that is, a number c between 1 and 2 such that fc) - Therefore we take a = and N = in the Intermediate Value Theorem. We have (1) = 6- 8 + 3 - 2 = -1<0 and f(2) = 48 - 32+6-2 = 20 > 0. Thus (1) < 0 < f(2); that is N = 0 is a number between f(1) and (2). Now fis continuous since it is a polynomial, so that the Intermediate Value Theorem says there is a number c between and such that f(c) = In other words, the equation 6x - 8x + 3x - 2 = 0 has at least one root c in the open interval In fact, we can locate a root more precisely by using the Intermediate Value Theorem again. Since (1.1) = -0.394 < 0 and (1.2) = 0.448 >0 %3! a root must lie between (smaller) and (larger). A calculator gives, by trial and error, (1.15) = -0.004750 < 0 and (1.16) = 0.080576 > 0. So a root lies in the open interval
Minimization
In mathematics, traditional optimization problems are typically expressed in terms of minimization. When we talk about minimizing or maximizing a function, we refer to the maximum and minimum possible values of that function. This can be expressed in terms of global or local range. The definition of minimization in the thesaurus is the process of reducing something to a small amount, value, or position. Minimization (noun) is an instance of belittling or disparagement.
Maxima and Minima
The extreme points of a function are the maximum and the minimum points of the function. A maximum is attained when the function takes the maximum value and a minimum is attained when the function takes the minimum value.
Derivatives
A derivative means a change. Geometrically it can be represented as a line with some steepness. Imagine climbing a mountain which is very steep and 500 meters high. Is it easier to climb? Definitely not! Suppose walking on the road for 500 meters. Which one would be easier? Walking on the road would be much easier than climbing a mountain.
Concavity
In calculus, concavity is a descriptor of mathematics that tells about the shape of the graph. It is the parameter that helps to estimate the maximum and minimum value of any of the functions and the concave nature using the graphical method. We use the first derivative test and second derivative test to understand the concave behavior of the function.
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