Method One: "Plug-in Method"
To do this, you could plug in two numbers for a and b to check that they get the same value:
[tex]a=2,b=3 \\ 3(a+b); 3a+3b \\ 3(2+3); 3(2)+3(3) \\ 3(5); 6+9 \\ 15; 15 \\ 15=15[/tex]
Therefore:
3(a+b)=3a+3b
Method Two: "Setting Equal Method"
By setting the two statements equal to each other, you can see they are the same because everything cancels out
[tex]3(a+b) = 3a+3b \\ \frac{3(a+b)=3a+3b}{3} \\ a+b=a+b \\ a+b-a=a+b-a \\ b=b \\ b-b=b-b \\ 0=0[/tex]
*Keep in mind these aren't theoretical names, simply what I'm calling my two methods!
I hope this helps!!
