Given a = {1, 2, 3, 4, 5, 6, 7, 8, 9} and b = {2, 4, 6, 8} what is AUB?
cestrela7 [59]
<span>AUB is the union of sets A and B.
It is a set that contains every element of set A and every element of set B.
Write a set that has all the numbers in both sets A and B. Be sure to write each number only once even if the number appears in both sets A and B.
</span>
Commutative - addition.
You're switching a and b to get the same answer. It works with Multiplication too, as you can tell!
Answer:
Step-by-step explanation:
we know that
Every difference of squares problem can be factored as follows:
If the polynomial represent a difference of squares every number must be a <u>perfect square</u> (Remember that a number is a perfect square if its square root is an integer.)
<em><u>Verify each case</u></em>
case 1) we have
In this case both numbers are perfect square
so
therefore
The polynomial represent a difference of squares
case 2) we have
In this case 8 is not a perfect square
therefore
The polynomial not represent a difference of squares
case 3) we have
In this case both numbers are perfect square
but is a sum of squares
therefore
The polynomial not represent a difference of squares
case 4) we have
In this case 2 is not a perfect square
therefore
The polynomial not represent a difference of squares
Answer:
c)-5(3x+2y)(3x-2y)
Step-by-step explanation:
1) lets find out if -45 and 20 have a GCF
-45 and 20 are both dividable by -5 so
-5(9x^2-4y^2)
1) you can see that 9 and -4 are perfect square so:
-5(3x+2y)(3x-2y)
Recheck:
1) lets use FOIL to see if this is right(if its right we will get back our original equation)
-5(9x^2-6xy+6xy-4y^2)
-5(9x^2-4y^2)
-45x^2+20y^2
hope this helps!