VOCABULARY Nº3 : EQUALS
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Equal:
Two quantities are said to be equal if they are, in some well defined sense, equivalent.
Equality:
A mathematical statement of the equivalence of two quantities. The equality A is equal to B is written A = B.
Inequality:
A mathematical statement that one quantity is greater than or less than another. a is less than b is denoted a < b, and a is greater than b is denoted a > b . a is less than or equal to b is denoted a ≤ b and a is greater than or equal to b is denoted a ≥ b The symbols a << b and a >> b are used to denote a is much less than b" and a is much greater than b, respectively.
Equation:
An equation is a mathematical statement, in symbols, that two algebraic expresions are the same (or equivalent).
Inequation:
A statement that two algebraic expressions are not the same, or do not represent the same value.
Cubic equation:
In mathematics, a cubic equation is a polynomial equation in which the highest occurring power of the unknown is the third power. The standard form of a cubic equation is ax^3+bx^2+cx+d=0
Quadratic equation:
In mathematics, a quadratic equation is a polynomial equation of the second degree. The general form is y=ax^2+bx+c
where a ≠ 0.
Linear equation:
A linear equation is an equation involving only the sum of constants or products of constants and the first power of a variable. Such an equation is equivalent to equating a first-degree polynomial to zero. These equations are called "linear" because they represent straight lines in Cartesian coordinates. A common form of a linear equation in two variables is y=ax+b
Coefficients of the equation:The letters a, b, and c are called coefficients: the quadratic coefficient a is the coefficient of x2, the linear coefficient b is the coefficient of x, and c is the constant coefficient, also called the free term.
