if a and b are irrational, must ab also be irrational ?

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2006-10-25 09:00:25 · 5 answers · asked by alaraby 1 in Education & Reference ➔ Homework Help

Suppose irrational is a negative sign. (-a) + (-b) = -(a+b) But (-a) x (-b) = (ab). or, (-2) + (-3) = (-5) but (-2) x (-3) = 6

Therefore, no.

2006-10-25 09:05:02 · answer #1 · answered by ULTIMATEMEANING 2 · 0⤊ 1⤋

Yup

2006-10-25 09:01:29 · answer #2 · answered by Anonymous · 0⤊ 1⤋

no
take for example (1-sqrt(2))*(1+sqrt(2)) which is natural though sqrt(2)+1 is irrational
sqrt = square root

2006-10-25 09:06:22 · answer #3 · answered by suzanna_banana 3 · 1⤊ 0⤋

two wrongs dont make a right.
god bless

2006-10-25 09:03:07 · answer #4 · answered by thewindowman 6 · 0⤊ 2⤋

It would seem so...

2006-10-25 09:01:50 · answer #5 · answered by Anonymous · 0⤊ 1⤋