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# Algebra Glossary - P a|b|c|d|e|f|g|h|i|l|m|n|o|p|q|r|s|t|u|v|w|x|y|z

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# parabola:

The set of all points in a plane that are the same distance from a point (focus) as they are from a given line (directrix). it is the graph of a quadratic function having a U shape.

# parallel lines:

Lines that have equal slopes.

# partial sum of a series:

The sum of a finite number of terms of the series.

# pascal's triangle:

A triangular arrangement of numbers in which each number is the sum of the two numbers above it in the preceding row.

# perfect square trinomial:

The square of a binomial. with the form a2 ± 2ab + b2.

# periodic function:

A function y=f(x) is periodic if and only if there is a real number p such that for each x in the domain of f. f(x + p)=f(x).

# permutation:

An arrangement of a number of objects in a definite order.

# perpendicular lines:

Lines with slopes that are negative reciprocals.

# point matrix:

A 2 x 1 matrix whose ele- ments are the coordinates of a point.

# point-slope form:

If (x1, y1) is a point on the line y = mx + b. then y - y1 = m(x - xl) is the point-slope form of the equation.

# polynomial:

A monomial or the sum of monomials.

# polynomial function:

A function P whose values are defined by a polynomial.

# power function:

Functions with equations of the form y = x^n, with it a positive integer.

# prime factorization:

A representation of a number as the product of its prime factors.

# principal cube root:

The one real-number cube root of a real number.

# principal square root:

The positive square root, denoted by

# principle square root function:

The function with the equation Ö

# probability of an event:

The ratio of the number of outcomes in the event to the number of outcomes in the sample space.

# pure imaginary number:

Any number of the form ai. where a is real.