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# Grade 8 Chapter 11

### Exponential and Radical Functions

common ratio In a geometric sequence, the constant ratio of any term and the previous term.
compound interest Interest earned or paid on both the principal and previously earned interest.
exponential decay An exponential function of the form f(x)= ab^x in which 0<b<1.
exponential function A function of the form f(x)=ab^x, where a and b are real numbers with a not equal to 0, b>0 and b is not equal to 1.
exponential growth A function of the form f(x)=ab^x in which b>1.
extraneous solution A solution of a derived equation tat is not a solution of the original equation.
geometric sequence A sequence in which the ratio of successive terms is a constant r, called the common ratio.
half-life The time it takes for one-half of the substance to decay into another substance.
like radicals Radical terms having the same radicand and index.
radical equation An equation that contains a variable within a radical.
radical expression An expression that contains a radical sign.
radicand The expression under a radical sign.
square-root function A function whose rule contains a variable under a square-root sign.
Created by: bookannelid