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Sum/Product - Rationals or Irrationals snucongo.org

Topical outline | Algebra 1 outline | MathBits" Teacher resources regards to Use contact Person: Donna Roberts


"The amount of two rational number is rational."

By definition, a reasonable number can be expressed together a fraction with integer worths in the numerator and also denominator (denominator not zero). So, adding two rationals is the very same as adding two together fractions, i m sorry will result in another portion of this same form since integers are closed under addition and multiplication. Thus, including two rational number produces another rational number.

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Proof:

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"The product of 2 rational numbers is rational."

Again, by definition, a rational number have the right to be expressed as a portion with integer values in the numerator and denominator (denominator no zero). So, multiplying 2 rationals is the same as multiplying two such fractions, i m sorry will an outcome in another portion of this same type since integers are closed under multiplication. Thus, multiplying 2 rational number produces an additional rational number.

Proof:

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look at out! This next component gets tricky!!

"The amount of two irrational numbers is periodically irrational."

The amount of two irrational numbers, in part cases, will certainly be irrational. However, if the irrational components of the numbers have actually a zero amount (cancel each other out), the amount will be rational.

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"The product of two irrational numbers is sometimes irrational."

The product of two irrational numbers, in some cases, will certainly be irrational. However, the is feasible that part irrational numbers may multiply to kind a reasonable product.

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Topical outline | Algebra 1 rundown | snucongo.org | MathBits" Teacher sources Terms of Use contact Person: Donna Roberts