magardibosh107 magardibosh107

03-11-2020
Mathematics

contestada

Let a * b = 3a + 2b for a, b e Z. Verify that * is a
commutative binary operation on Z.
[2]

Respuesta :

LammettHash LammettHash

04-11-2020

It's not commutative:

a * b = 3a + 2b

but

b * a = 3b + 2a

We have equality only for

3a + 2b = 3b + 2a → a = b

Answer Link

Otras preguntas

who created the Ursuline order

Describe what the idea of "rule of law" meant to the average Roman.

Each of the 23 students in Mrs.Evans' class raised $45 for the school by selling coupon books. How much money did the class raise in all?

Which conservation effort helps to conserve trees? A. melting down glass bottles B. recycling newspapers C. reusing tin cans D. driving a hybrid car

A zoology student is investigating whether it is true that the gender of turtles depends on the temperature at which the turtle eggs are kept before they hatch.

Which one of the following is not true of the Dred Scott decision? Slaves are not free because they are property of their master. Property cannot be denied an

Factor completely. 15a² + 55a - 20 A. 5(3a² + 11a - 4) B. 5(a + 4)(3a - 1) C. (5a + 2)(3a - 10) D. (5a + 4)(3a - 5)

name 2 ways forelimbs are different than hind limbs.

raise 2/7 to a fraction with denominator of 28.

a dog weighs 44 pounds and the veterinaria