1 year ago

Help is for today ( this is sets) pls

1 answer:

5 0

Answer:

Step-by-step explanation:

There are 30 English

There are 28 German

There is one that speaks all 3

30 + 28 - 1 = 57

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ss7ja [257]

Answer:

a difference of squares

Step-by-step explanation:

Let's write down the expression:

$(a^2)^2 -(b^2)^2$

we can see that this expression is one of the form $x^2 -y^2$ which is the general expression of a difference of squares.

To be more specific and to see why we say this, let's make $x=a^2$ and $y=b^2$

Now, if we substitute this in the general formula, we get:

$x^2 -y^2 =(a^2)^2 -(b^2)^2$

Thus, this expression is a difference of squares.

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3 years ago