11 x1 t02 02 rational & irrational (2013)
TRANSCRIPT
Rational Numbers
Rational NumbersRational numbers can be expressed in the form where a and b are integers. b
a
Rational NumbersRational numbers can be expressed in the form where a and b are integers. b
a
Irrational Numbers
Rational NumbersRational numbers can be expressed in the form where a and b are integers. b
a
Irrational NumbersIrrational numbers are numbers which are not rational.
All irrational numbers can be expressed as a unique infinite decimal.
irrational is 2 Prove ..ge
irrational is 2 Prove ..ge“Proof by contradiction”
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k where k is an integer
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k where k is an integer2 2b k
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k
factorcommon a havemust and 2by divisibleboth are and So 22 ba
where k is an integer2 2b k
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k
factorcommon a havemust and 2by divisibleboth are and So 22 baHowever, a and b have no common factors
where k is an integer2 2b k
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k
factorcommon a havemust and 2by divisibleboth are and So 22 baHowever, a and b have no common factors
rationalnot is 2so
where k is an integer2 2b k
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k
factorcommon a havemust and 2by divisibleboth are and So 22 baHowever, a and b have no common factors
rationalnot is 2soirrational is2
where k is an integer2 2b k
irrational is 2 Prove ..ge“Proof by contradiction”
rationalis 2 Assume
ba
2 where a and b are integers with no common factors
ab 2222 ab
2by divisible bemust Thus 2a4by divisible is2by divisibleisthat squareAny
4by divisible bemust Thus 2a2 2 4b k
factorcommon a havemust and 2by divisibleboth are and So 22 baHowever, a and b have no common factors
rationalnot is 2soirrational is2 Exercise 2B; 2a, 3, 4 (root 3), 8, 14*
where k is an integer2 2b k