Questions and Answers
What is the general form of a linear equation with one variable?
ax+b=c
What is the quadratic formula used for?
Solving quadratic equations
What is the difference between inconsistent and undetermined systems of linear equations?
Inconsistent systems have no solutions, while undetermined systems have infinitely many solutions
What is the purpose of algebraic notation?
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What is the difference between a quadratic equation in the real number system and the complex number system?
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What is the difference between solving linear equations with one variable and solving linear equations with two variables?
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What is the purpose of exponential equations?
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What is the difference between a radical equation and a logarithmic equation?
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What is the difference between a conditional equation and an identity equation?
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Study Notes
Basic Concepts of Algebra

Elementary algebra introduces variables (quantities without fixed values).

It builds on arithmetic and is taught to secondary school students.

Algebraic notation includes coefficients, terms, variables, and constants.

Algebraic operations include addition, subtraction, multiplication, division, and exponentiation.

Alternative notation is used when formatting is not available.

Variables represent general (nonspecified) numbers.

Algebraic expressions may be evaluated and simplified.

Equations use the symbol for equality (=) and state that two expressions are equal.

Conditional equations are true for only some values of the involved variables.

An identity equation is true for all values of the involved variables.

Algebra is used to express many quantitative relationships in science and mathematics.

Elementary algebra is not concerned with algebraic structures outside the realm of real and complex numbers.Understanding Algebraic Equations

Algebraic equations are mathematical expressions that state the equality of two or more unknown variables.

Equations can be solved by finding the values of the variables that make the equation true.

Inequalities are used to show that one side of the equation is greater or less than the other.

The properties of equality include reflexivity, symmetry, and transitivity.

Substitution is replacing the terms in an expression to create a new expression or statement.

Solving algebraic equations requires isolating the variable by adding, subtracting, multiplying, or dividing both sides of the equation by the same number.

Linear equations with one variable contain only constant numbers and a single variable without an exponent.

The general form of a linear equation with one variable can be written as ax+b=c.

Linear equations with two variables require two related equations to solve.

Quadratic equations include a term with an exponent of 2 and can be solved using the quadratic formula.

The quadratic formula is x = (b ± sqrt(b^24ac))/2a.Algebraic Equations Summary

A quadratic equation is a seconddegree polynomial equation in a single variable.

A quadratic equation can be expressed in the form ax² + bx + c = 0, where a, b, and c are coefficients.

All quadratic equations will have two solutions in the complex number system, but need not have any in the real number system.

Quadratic equations can be solved using the quadratic formula or factorization.

An exponential equation is one that has the form a^x = b, and it has a solution of x = log_a(b).

A logarithmic equation is one that has the form log_a(x) = b, and it has a solution of x = a^b.

A radical equation is one that includes a radical sign, which includes square roots, cube roots, and nth roots.

An nth root can be rewritten in exponential format, so that x^(1/n) is equivalent to the nth root of x.

A quadratic equation must contain the term ax², which is known as the quadratic term.

Quadratic equations can be solved using completing the square, which leads to the quadratic formula.

A quadratic equation can have a root of multiplicity 2, which means the root appears twice.

Complex numbers first arise in the teaching of quadratic equations and the quadratic formula.Solving Linear Equations with Two Variables

A radical equation is of the form x^(3/2) or (x^m/n). It can be solved using the formula sqrt[n]{x^m}=a.

A system of linear equations can be solved using different methods, including elimination and substitution.

In the elimination method, equations are added or subtracted to eliminate one variable and solve for the other.

In the substitution method, one variable is isolated from one equation and substituted into the other equation.

Some systems of linear equations are inconsistent, meaning they have no solution. An example is 0x+2y=3 and 0x+2y=4.

Some systems of linear equations are undetermined, meaning they have infinitely many solutions. An example is x+2y=6 and 2x+4y=12.

Some systems of linear equations are underdetermined, meaning they have more variables than equations. An example is x+2y+z=6 and x+y=3.

Some systems of linear equations are overdetermined, meaning they have more equations than variables. If they have any solutions, some equations are linear combinations of the others.
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